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WO2014132018A1 - Tapis contact - Google Patents

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Publication number
WO2014132018A1
WO2014132018A1 PCT/GB2014/000066 GB2014000066W WO2014132018A1 WO 2014132018 A1 WO2014132018 A1 WO 2014132018A1 GB 2014000066 W GB2014000066 W GB 2014000066W WO 2014132018 A1 WO2014132018 A1 WO 2014132018A1
Authority
WO
WIPO (PCT)
Prior art keywords
mat
conductive layer
pressure
resistive
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2014/000066
Other languages
English (en)
Inventor
David Jones
Simon John HARRISON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ISENSOL Ltd
Original Assignee
ISENSOL Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ISENSOL Ltd filed Critical ISENSOL Ltd
Publication of WO2014132018A1 publication Critical patent/WO2014132018A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/205—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using distributed sensing elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/1036—Measuring load distribution, e.g. podologic studies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
    • G01L5/226—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to manipulators, e.g. the force due to gripping
    • G01L5/228—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to manipulators, e.g. the force due to gripping using tactile array force sensors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/10—Mechanical actuation by pressure on floors, floor coverings, stair treads, counters, or tills
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles

Definitions

  • This invention relates to a pressure mat.
  • pressure mats provide a binary on/off reading as to whether a pressure is detected on the pressure mat.
  • UK patent application publication GB 2 343 516 A discloses a fabric pressure sensor that comprises conductive layers or strips and an insulating separator.
  • the pressure sensor includes upper and lower conductive layers separated by an intermediate insulating layer which is formed as a separating mesh.
  • the insulation layer keeps the conductive layers apart in an open circuit configuration until pressure is applied.
  • the upper conductive layer is of negligible resistance.
  • the lower conductive layer is formed of a plurality of conductive strips separated by insulating strips. Each conductive strip has a known resistance. An electrical signal is applied to the conductive strips in turn and the electrical path between the upper and lower conductive layers then determined.
  • the electrical resistance of the conductive path establishes the location of the pressure point at which bridging occurs and from this it is possible to establish the location and size of the pressure area. While this sensor is able to give more detailed information about the pressure being applied to the sensor, the design of the sensor is complex and expensive, which is very unlikely to provide a commercially viable solution that is sufficiently effective.
  • a pressure mat comprising a first conductive layer, a segmented resistive layer in direct contact with the first conductive layer, and an electrical circuit connected to the first conductive layer and arranged to detect changes in resistance.
  • a method of operating a pressure mat comprising a first conductive layer, a segmented resistive layer in direct contact with the first conductive layer, and an electrical circuit connected to the first conductive layer, the method comprising the steps of supplying an electric current from the electrical circuit to the connected first conductive layer and detecting changes in resistance.
  • a pressure mat that captures more information than just the detection of a pressure on the mat, while being of simple and straightforward construction.
  • a segmented resistive layer in the construction of the pressure mat and detecting the change in the resistance in the pressure mat, it is possible to detect further information about the type of pressure being applied to the pressure mat.
  • This additional information could relate to the magnitude of the pressure being applied, the surface area of the object applying the pressure and its location on the pressure mat, and/or the type of object that is applying the pressure to the pressure mat, for example. Movement of an object on the mat can also be detected.
  • the occupancy detection mat is a device used to detect the presence, non-presence, addition or removal of an object/weight on its surface.
  • the mat is constructed of layers of conductive and optionally non-conductive materials in multiple configurations and formats as per the need of the application it is used for.
  • the mat can detect objects of various weight and size with a ratiometric output level relative to the weight and applied surface area.
  • the mat can be a stand-alone device or a peripheral sensor to a host system.
  • the mat has the ability to detect the presence of an applied load.
  • the output of the mat is a value of electrical resistance.
  • the output of the mat is relative to the applied mass and surface area of the applied mass. This provides different outputs relative to different loads and surface areas, thereby giving a ratiometric output relative to applied mass and surface area.
  • An example of the pressure mat's behaviour may be considered if an object similar in shape, size and weight to a house brick (rectangular block, sides/faces of differing shape/surface area) is applied to the mat. Although the applied mass/weight of the object is the same, the resistance of the mat would be different for each side/face of the object of differing surface area. This gives the ability to detect the orientation of an applied mass, movement of the mass, addition to the mass and reduction of the mass.
  • the pressure mat further comprises a second conductive layer located on the opposite side of the resistive layer to the first conductive layer.
  • the second conductive layer is in direct contact with the resistive layer.
  • the first conductive layer comprises two independent electrical conductors and the electrical circuit is connected to the two independent electrical conductors.
  • a single conductive layer can have two independent conductors present, both of which are connected to the electrical circuit. This simplifies aspects of the construction and operation of the pressure mat, as only one layer needs to be connected to the electrical circuit and the resistive layer will make a connection between the two independent conductors, when pressure is applied to the pressure mat.
  • the segmented resistive layer comprises a plurality of regular zones of resistive material separated by insulating material.
  • the resistive layer is segmented in the sense that it is formed of individual segments of resistive material, which may be of uniform resistance or may have different resistances. The segments may be in contact with each other but are preferably spaced apart by intervening insulating material.
  • the zones of resistive material could be the same size and shape, but do not need to be.
  • the resistive layer could be formed from an array of rectangular zones of resistive material that are spaced apart by the insulating material.
  • Figures 2a to 2d are diagrams of electrical circuits modelling the behaviour of the pressure mat
  • Figures 3a and 3b are schematic diagrams of two different embodiments of a conductive layer of the pressure mat
  • Figures 4a and 4b are schematic diagrams of two different embodiments of a resistive layer of the pressure mat
  • Figure 5 is a schematic diagram of a preferred embodiment of layers of the pressure mat.
  • Figure 6 is a schematic diagram showing electrical connections within three different pressure mats.
  • Figure 1 shows the pressure mat 10 schematically as a series of layers.
  • the mat 10 is constructed of layers and/or segments of conductive, resistive and non-conductive materials. The materials used may differ per configuration and design per application. The configuration of the layers and/or segments may differ per configuration and design.
  • the inner layers can be bonded together to retain position and form as a whole or selectively or simply held in place by the outer layers.
  • Figure 1 shows a simple construction of the pressure mat 10, with no mass applied.
  • the mat 10 comprises upper and lower outer protective layers 26, an upper resistive layer 14 and a lower conductive layer 12, which is in direct contact with the resistive layer 14.
  • An electrical circuit (not shown) is connected to the first conductive layer 12 and can also in some embodiments be connected to the resistive layer 14.
  • a number of resistive zones will have pressure applied in relation to the mass and the size of the mass applied to each zone. This combination will result in an electrical resistance formed per zone. Applying the same mass with a different sized mass or different mass of the same size will result in a different resistance formed, providing detection of mass movement and/or change.
  • An example would be the use of the mat in a baby crib. A child standing or lying down on the mat in both positions would have the same mass, but a different applied physical area, as such, each case would give a different resistance value. If the child was removed or another mass also applied (for example a pet) or a child of different weight assumed the same positioning, then again difference resistance values would be created allowing determination of all scenarios.
  • Figure 2 show the equivalent electrical circuits of the mat 10, thereby showing an electrical model of the mat 10.
  • the relationship between surface area and received pressure is equivalent to a variable resistor.
  • Figure 2a shows the equivalent circuit of the mat 10 with no mass applied. The circuit is the equivalent of a variable resistor set to high value as no mass is applied.
  • Figure 2b shows the equivalent circuit of the mat 10 with some mass applied. The circuit is the equivalent of a variable resistor set to a lower value as some mass is applied. This is the equivalent of a single area of pressure applied.
  • Figure 2c shows the equivalent circuit of the mat 10 with yet more mass applied. The circuit is the equivalent of a variable resistor set to a lower value as more mass is applied. This is the equivalent of a single area of pressure applied.
  • Figure 2d shows the equivalent circuit of the mat 10 with mass applied to multiple areas.
  • the circuit is equivalent to having multiple variable resistors set to values relating to the mass applied. This is the equivalent of multiple areas of pressure applied.
  • Figure 2d only illustrates two areas of pressure/mass applied.
  • the actual configuration and equivalent circuit may be much more complex in actual applications and usage.
  • the mat 10 is preferably provided with outer covering, rigid and protective layers 26.
  • the mat 10 will have outer covering layer(s) 26 that may be used to provide protection for the internal layers and segments from general liquid and/or dirt ingress.
  • the outer covering 26 may also provide higher waterproof and ingress protection if needed.
  • the outer covering may also have protective materials to prevent cutting, abrasion, piercing, handling and application specific needs.
  • a rigid or semi-rigid layer may also be used to provide strength and retain shape/form.
  • the conductive layers and/or segments may be conductive or resistive and may include (but not limited to) metal foil, sheet, thread, wire or tape, metalized foil, thread, wire or tape, metalized plastic, fibre or fabric, printed or deposited conductive ink or material on a substrate or an etched conductive layer.
  • the conductive materials will be configured and formed to assist the application requirement of the mat 10. The configuration may require single or multiple conductive layers or segments. At least one layer and/or segment will be a resistive layer 14, in order to provide ratiometric behaviour.
  • the resistive material will provide a resistive value per m or m 2 .
  • a resistive layer 14 and conductive foil layer 20 may be used together as per the requirements of the application or assembly constraints.
  • the resistive material will preferably be a plastic sheet with conductive properties, offering a resistance over its surface area, thereby providing surface resistivity.
  • conductive/resistive materials are used as antistatic protection and storage. Examples of such material include, but are not limited to Carbon-filled PEEK (PolyEtherEtherKetone), Tempalux® (PolyEtherlmide), PES (PolyEtherSulfone), PVDF (PolyVinyliDene Fluoride), Pomalux® (Acetal Copolymer), Lennite® (UHMW Polyethylene) and Zelux® (Polycarbonate).
  • Segmented conductive layers may be constructed of one or more electrical circuits.
  • Figure 3a shows a configuration of a first conductive layer 12, shown from above. The shaded area in the Figure represents conductive material and shows a single electrical circuit on the conductive layer 12 shaped like a comb.
  • Figure 3b shows a second configuration of a first conductive layer 12 seen from above, using multiple (two in this example) electrical conductors 22 on the conductive layer 24. The two conductors 22 that make up the first conductive layer 12 are electrically independent of each other. In the example of Figure 3b, the two conductors 22 are formed as two combs with the teeth of the combs interlocking but not touching.
  • Segmented resistive layers 14 are constructed from multiple resistive elements.
  • the segments can be of any shape, size or form.
  • Figure 4a shows a resistive layer 14 constructed from multiple resistive segments.
  • Figure 4b shows a different embodiment of the resistive layer 14, which is constructed from multiple segments arranged as zones or areas, creating multiple resistive elements in order to create different sensing arrangements.
  • the relation between the amount of pressure forcing contact of the resistive and conductive layers is directly proportional to the generated resistance.
  • the relation between the amount of resistive material in contact with conductive layer is also directly proportional to the generated resistance. Therefore, the relation between both amount of pressure applied and amount of resistive material in contact with the conductive layer is directly proportional to the generated resistance.
  • a mass of a smaller physical size will force contact between the resistive material and conductive layer in relation to the size of the physical mass and available conductive layer to which the mass was applied, generating a proportional resistance to those factors. If the applied mass was physically larger, the surface area of contacted resistive material and conductive layer would increase, reduction of the physical size would be the inverse.
  • a mat may require many zones, each zone may also have different resistive material and/or conductor size/space/count arrangement providing areas of greater and lesser sensitivity and resolution of the resistance. Multiple zones may also be have multiple electrical connections as shown below in Figure 6c
  • Figure 5 shows an example of a preferred arrangement of the layers within the mat 10. Views from above of each layer are shown, with top to bottom through the layers in the Figure indicating the layers from top to bottom in the physical mat 0.
  • the outer and rigidity layers of the pressure mat 10 are not discussed or shown.
  • Figure 5 shows the mat 10 comprised of a printed conductive layer 12 having two electrical conductors 22 and a segmented resistive layer 14. Only the printed layer 12 has connections to the electrical circuit.
  • the pressure mat 10 is comprised of these two layers only, in direct contact, with the resistive layer 14 on top of the conductive layer 12. Any weight on the mat 10 will cause connections to be made between the two conductors 22 via one or more resistive segments within the resistive layer 14.
  • the electrical construction of the pressure mat 10 uses external connections which will be made via a connector (connector style and type will vary per application design) or internally wired connection to external wires
  • the number of external electrical connections to the mat 10 will take two forms. Firstly, single contact construction can be used. In this form, there will be only two connections to the mat 10. Secondly, multiple contact/feature construction can be used. In this form, there may be multiple connections to the mat.
  • Figure 6 shows three different connection options for the pressure mat 10. These three embodiment show top views of the pressure mat 10.
  • the first conductive layer is connected via one wire to an electrical circuit 16 and the resistive layer is connected via a second wire to the electrical circuit 16.
  • two mat assemblies A and B are present that are isolated from each other within the pressure mat 10.
  • a single wire connects the resistive layers in both assemblies to the electrical circuit 16 and individual wires connect the conductive layers in the individual assemblies to the electrical circuit 16.
  • One wire connects the resistive layers in assemblies A and C to the electrical circuit 16 and a second wire connects the resistive layers in assemblies B and D to the electrical circuit 16.
  • a third wire connects the conductive layers in assemblies A and B to the electrical circuit and a further wire connects the conductive layers in assemblies C and D to the electrical circuit.
  • the electrical circuit 16 is providing power to the pressure mat and is also detecting the resistance in the pressure mat 10. Since the conductive layer 12 and the resistive layer 14 are in direct contact there will always be some resistance present in the mat 10, even if no weight is being placed on the mat 10. As different objects of different weights and sizes are detected by the 10, then different resistances will be produced, which will allow the circuit 16 to detect these changes.
  • a sophisticated computing system can be connected to the circuit 16 in order to provide monitoring functions, as desired by the specific application in which the mat 10 is being used.
  • the internal connections between layers, segments and external connections may be stitched, stapled, soldered, welded, crimped, bonded, compression, eyelet or other suitable method for the materials used.
  • the internal electrical connections between layers, segments and external connections will differ as per the application requirements.
  • the mat 10 may be connected to an external device that monitors the mat connections.
  • This device may be a standalone device or have some connectivity to other systems or devices via cable or wireless communications
  • This device can be portable or fixed by nature of installation
  • This device may be powered from a mains supply or battery.
  • This monitoring/control device may be built into the mat 10.
  • the pressure mat 10 has a wide variety of different uses and applications.
  • the mat 10 could be used for bed occupancy detection (elderly and/or patient care/monitoring).
  • the mat 10 may be fitted under, over the mattress as an aftermarket product.
  • the mat 10 may be fitted to the mattress at manufacture or the mat 10 may be fitted to the bed itself during manufacture. This will provide monitoring of the occupancy of the bed. The detected value will also change subject to the occupier lying on the side, front/back or sitting.
  • the pressure mat 10 could be used for child bed/cot occupancy detection.
  • the mat 10 may be fitted under, over the mattress as an aftermarket product.
  • the mat 10 may be fitted to the mattress at manufacture or the mat 10 may be fitted to the bed/cot itself during manufacture. This will provide monitoring of the occupancy of the bed/cot.
  • the detected value will change subject to the occupier lying on the side, front/back, standing or sitting. Removal of the child from the cot/bed (by a third party or child escape) can be detected.
  • the mat 10 could also be used for monitoring sofa and chair occupancy.
  • the mat 10 may be fitted under or over the cushion as an aftermarket product or the mat 10 may be fitted to the furniture at manufacture. This can be used for elderly care monitoring, allowing daily activity and home/room occupancy monitoring of a non-intrusive nature.
  • the pressure mat 10 can also be used as a floor mat. This may be used for elderly care monitoring, allowing daily activity and home/room occupancy monitoring of a non-intrusive nature. This may be used for security monitoring, monitoring stairs, doorways or any floor area. Due to the ratiometric detection, lower masses, such as pet or child detection could be distinguished and detected. If the mat 10 is being used as a floor mat, then direction detection can be utilised. By using at least two mats 10, direction detection may be detected. This could allow detection and/or counting of people entering or leaving a room for example.
  • Multiple pressure mats 10 can be used to create a floor mat array. By using multiple mats 10, wider area monitoring and detection is possible.
  • the mats 10 can be configured in any shape or form factor.
  • the mats 10 can be connected to a monitoring device as individual mats or in an array or matrix configuration.
  • Theft/removal detection such as electronic equipment theft can be prevented using the pressure mat 10.
  • a mat 10 could be placed under a valuable item, monitoring its presence and alerting of its removal.
  • Theft/removal/tamper detection could be used in a museum or stately home to protect heritage furniture, for example.
  • a mat 10 could be placed under a valuable item, for example a chair, monitoring its presence and alerting of its removal and also monitoring if someone sat on it for example.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Pathology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Push-Button Switches (AREA)

Abstract

La présente invention concerne un tapis contact (10) comportant une première couche conductrice (12), une couche résistive segmentée (14) en contact direct avec la première couche conductrice (12) et un circuit électrique (16) connecté à la première couche conductrice (12) et conçu pour détecter des changements de résistance.
PCT/GB2014/000066 2013-03-01 2014-02-27 Tapis contact Ceased WO2014132018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1303663.7A GB2511356B (en) 2013-03-01 2013-03-01 Pressure mat
GB1303663.7 2013-03-01

Publications (1)

Publication Number Publication Date
WO2014132018A1 true WO2014132018A1 (fr) 2014-09-04

Family

ID=48142240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2014/000066 Ceased WO2014132018A1 (fr) 2013-03-01 2014-02-27 Tapis contact

Country Status (2)

Country Link
GB (1) GB2511356B (fr)
WO (1) WO2014132018A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019033060A1 (fr) * 2017-08-10 2019-02-14 Joyson Safety Systems Acquisition Llc Système de détection d'occupant
US11788918B2 (en) 2020-06-18 2023-10-17 Trevillyan Labs, Llc Fluid detection fabric

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2557317A (en) * 2016-12-06 2018-06-20 Geoffrey Manby David Load-detecting flooring

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763534A (en) * 1985-01-31 1988-08-16 Robert G. Fulks Pressure sensing device
EP0658753A1 (fr) * 1993-12-17 1995-06-21 Home Row, Inc. Réseau de transducteurs
WO2000079546A1 (fr) * 1999-06-22 2000-12-28 Peratech Ltd Structures conductibles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2634926B1 (fr) * 1988-07-27 1994-03-25 Electronique Controle Mesure Sa Dispositif de detection d'appui sur une surface, par caoutchouc charge de carbone
US5878620A (en) * 1997-01-23 1999-03-09 Schlege Systems, Inc. Conductive fabric sensor for vehicle seats
GB2343516A (en) * 1998-11-03 2000-05-10 Univ Brunel Fabric pressure sensor comprising conductive layers or strips and an insulating separator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763534A (en) * 1985-01-31 1988-08-16 Robert G. Fulks Pressure sensing device
EP0658753A1 (fr) * 1993-12-17 1995-06-21 Home Row, Inc. Réseau de transducteurs
WO2000079546A1 (fr) * 1999-06-22 2000-12-28 Peratech Ltd Structures conductibles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019033060A1 (fr) * 2017-08-10 2019-02-14 Joyson Safety Systems Acquisition Llc Système de détection d'occupant
US10696186B2 (en) 2017-08-10 2020-06-30 Joyson Safety Systems Acquisition Llc Occupant detection system
US11788918B2 (en) 2020-06-18 2023-10-17 Trevillyan Labs, Llc Fluid detection fabric
US12123807B2 (en) 2020-06-18 2024-10-22 Trevillyan Labs, Llc Fluid detection fabric

Also Published As

Publication number Publication date
GB201303663D0 (en) 2013-04-17
GB2511356A (en) 2014-09-03
GB2511356B (en) 2016-02-17

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