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US20120096631A1 - Omni-directional angular acceration reduction for protective headgear - Google Patents

Omni-directional angular acceration reduction for protective headgear Download PDF

Info

Publication number
US20120096631A1
US20120096631A1 US13/380,579 US201013380579A US2012096631A1 US 20120096631 A1 US20120096631 A1 US 20120096631A1 US 201013380579 A US201013380579 A US 201013380579A US 2012096631 A1 US2012096631 A1 US 2012096631A1
Authority
US
United States
Prior art keywords
helmet
angular acceleration
inner shell
intermediate layer
thin 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.)
Abandoned
Application number
US13/380,579
Other languages
English (en)
Inventor
Albert I. King
King Hay Yang
Liying Zhang
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.)
Wayne State University
Original Assignee
Wayne State University
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 Wayne State University filed Critical Wayne State University
Priority to US13/380,579 priority Critical patent/US20120096631A1/en
Publication of US20120096631A1 publication Critical patent/US20120096631A1/en
Assigned to WAYNE STATE UNIVERSITY reassignment WAYNE STATE UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YANG, KING HAY, KING, ALBERT I., ZHANG, LIYING
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/06—Impact-absorbing shells, e.g. of crash helmets
    • A42B3/062—Impact-absorbing shells, e.g. of crash helmets with reinforcing means
    • A42B3/063—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures
    • A42B3/064—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures with relative movement between layers

Definitions

  • the present disclosure is related to apparatus and methods for reducing brain injuries associated with head impacts by mitigating angular acceleration of the head during impacts.
  • Various types of protective headgear have been developed to reduce injuries to the brain, skull, and neck resulting from head impacts.
  • Existing helmet designs often employ a hard outer shell in combination with internal padding made of an energy-absorbing material.
  • the internal padding may be secured to the outer shell by chemical fasteners, such as adhesives, or by mechanical fasteners, such as hook and loop closures, or similar structures, for example.
  • While conventional helmet designs generally reduce injuries associated with linear acceleration due to impacts, they may not adequately protect users from brain injuries such as subdural hematoma and diffuse axonal injuries, for example, that may be associated with angular or rotational acceleration. These types of injuries have been recognized in the prior art with one proposed solution providing a protective helmet having an outer shell separated from an inner shell by a sliding layer to allow relative displacement between the inner and outer shells. Relative movement is constrained by a deformable connecting member secured to both the inner and outer shells.
  • Another prior art strategy allows an outer layer to yield relative to an inner layer when subjected to a tangential force that exceeds a selected threshold by using rupturing means for attaching the outer layer to the remainder of the headgear.
  • a similar approach relies on a frictional coupling between the outer and inner shells to allow relative movement during an impact.
  • movement between frictionally coupled surfaces is generally difficult to control and requires a larger starting force to overcome the static friction and lower sustaining force to overcome the dynamic friction during an impact event.
  • the apparatus and methods of the present disclosure solve one or more problems of the prior art by providing protective headgear having an outer shell designed to rotate with respect to a user's head by insertion of a thin layer of elastically and/or plastically yielding material between the outer shell and an inner shell.
  • the yielding material deforms continuously but non-linearly at least in the tangential or shear direction to control angular acceleration of the head.
  • the yielding material prevents the inner and outer shells from separating or stopping suddenly to avoid imparting a large angular acceleration to the head.
  • a protective helmet in one embodiment, includes an outer shell secured to an inner shell by a yielding material that elastically deforms continuously but non-linearly when subjected to an angular acceleration below a first threshold and plastically deforms when subjected to an angular acceleration above the first threshold.
  • the first threshold is about 6000 rad/s/s (rad/s 2 ).
  • the yielding material of the inner layer has a rate-dependent shear stiffness that increases non-linearly as the deformation approaches the limit of separating the two layers by relative rotation.
  • Embodiments of the present disclosure have various advantages. For example, protective headgear according to the present disclosure reduces angular acceleration of the head to reduce the risk of brain injury to the wearer.
  • Use of a yielding material with rate-dependent shear characteristics provides continuous displacement between inner and outer shells with a low or near-zero threshold for initial movement upon impact.
  • Use of an elastically deformable yielding material with nonlinear shear characteristics facilitates applications where repeated impacts may occur, such as in football helmets, for example.
  • the yielding material is generally isotropic to allow relative rotation between the inner and outer shell regardless of the direction of impact or the location of the impact.
  • Protective headgear embodiments according to the present disclosure can also control for the tightness of fit between the head and the headgear using appropriate selection of the yielding material for a particular application.
  • FIG. 1 is a partial cross-section cut-away of a protective helmet according to one embodiment of the present disclosure.
  • FIG. 2 is a curve illustrating representative shear characteristics of a yielding material for use in an apparatus or method for reducing angular acceleration of the head during impacts according to one embodiment of the present disclosure.
  • a cross-section of a representative helmet 10 includes an inner shell 12 and an outer shell 14 generally surrounding inner shell 12 .
  • Outer shell 14 and inner shell 12 are separated by a thin layer 16 of a yielding material to allow relative displacement or movement between inner shell 12 and outer shell 14 during an impact.
  • layer 16 is disposed between, and secured to, both inner shell 12 and outer shell 14 .
  • Inner shell 12 is generally made of an elastically or plastically deformable energy absorbing material that may vary depending on the type of protective headgear or helmet 10 .
  • headgear intended for a single impact such as a bicycle or motorcycle helmet
  • headgear intended for repeated impacts of generally lesser force such as a football helmet
  • an elastically deformable inner shell 12 may be included in headgear intended for a single impact
  • headgear intended for repeated impacts of generally lesser force such as a football helmet
  • layer 16 is a yielding material having a non-linear rate-dependent shear characteristic such that layer 16 deforms during an impact so outer shell 14 is displaced relative to inner shell 12 to reduce angular acceleration imparted to a head of a user (not shown).
  • layer 16 may be made of a yielding material that is elastically deformable and/or plastically deformable depending upon the particular application.
  • FIG. 2 is a graph 30 illustrating shear characteristics of a representative yielding material for use in forming intermediate layer 16 in protective headgear 10 according to one embodiment of the present disclosure.
  • the representative yielding material has a non-linear increasing shear stiffness/stress as the strain/deformation increases.
  • the yielding material may have an elastically deformable characteristic 32 up to a first threshold, generally represented by peak 34 , where plastic deformation occurs and the shear stiffness may decrease with increasing deformation beyond peak 34 .
  • the yielding material characteristics should generally be selected so that shear stiffness continually and non-linearly increases from a near-zero starting point with peak 34 representing failure of the material to avoid separation of the inner shell 12 from the outer shell 14 , and a large angular acceleration being imparted to the head due to a sudden stop in relative movement between inner shell 12 and outer shell 14 .
  • thin layer 16 deforms continuously but non-linearly with increasing shear stiffness as deformation/strain increases.
  • layer 16 includes a material that is generally isotropic in the shear direction such that outer shell 14 rotates with respect to inner shell 12 regardless of the direction of impact, or the location of impact.
  • the representative yielding material may be selected with shear properties such that relative rotation between the inner and outer layers begins at a desired torque corresponding to a tightness of fit for a particular type of helmet.
  • the shear stiffness is near zero for an application such as a bicycle helmet, but may be increased for tighter fitting helmets, such as a football helmet, for example.
  • the yielding material should have a shear stiffness wherein resistance to relative rotation between inner shell 12 and outer shell 14 increases as a function of extent of rotation or displacement to avoid a sudden stop and associated large angular acceleration to the head as previously described.
  • the protective headgear as generally illustrated in the cross-section of FIG. 1 using an intermediate layer 16 between inner shell 12 and outer shell 14 having the characteristics generally illustrated and described with respect to FIG. 2 illustrates one embodiment of a method according to the present disclosure.
  • the method for mitigating angular acceleration imparted through protective headgear to a user includes securing inner shell 12 of the headgear 10 to an intermediate layer 16 and securing outer shell 14 of headgear 10 to an opposite side of intermediate layer 16 , wherein intermediate layer 16 is a yielding material having a shear stiffness that increases nonlinearly with increasing relative displacement of inner shell 12 and outer shell 14 due to increasing deformation of the yielding material.
  • embodiments of the present disclosure include protective headgear having various advantages.
  • protective headgear 10 reduces angular acceleration of the head to reduce the risk of brain injury to the wearer.
  • Use of a yielding material for intermediate layer 16 with rate-dependent shear characteristics provides continuous displacement between inner 12 and outer shells 14 with a low or near-zero threshold for initial movement upon impact.
  • Use of an elastically deformable yielding material with nonlinear shear characteristics facilitates applications where repeated impacts may occur, such as in football helmets, for example.
  • use of a yielding material that is generally isotropic allows relative rotation between the inner 12 and outer shell 14 regardless of the direction of impact or the location of the impact.
  • Protective headgear embodiments according to the present disclosure can also control for the tightness of fit between the head and the headgear using appropriate selection of the yielding material for a particular application.

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  • Helmets And Other Head Coverings (AREA)
US13/380,579 2009-06-25 2010-06-24 Omni-directional angular acceration reduction for protective headgear Abandoned US20120096631A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/380,579 US20120096631A1 (en) 2009-06-25 2010-06-24 Omni-directional angular acceration reduction for protective headgear

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US22026809P 2009-06-25 2009-06-25
US13/380,579 US20120096631A1 (en) 2009-06-25 2010-06-24 Omni-directional angular acceration reduction for protective headgear
PCT/US2010/039769 WO2010151631A1 (fr) 2009-06-25 2010-06-24 Réduction d'accélération angulaire omnidirectionnelle pour casque de protection

Publications (1)

Publication Number Publication Date
US20120096631A1 true US20120096631A1 (en) 2012-04-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/380,579 Abandoned US20120096631A1 (en) 2009-06-25 2010-06-24 Omni-directional angular acceration reduction for protective headgear

Country Status (2)

Country Link
US (1) US20120096631A1 (fr)
WO (1) WO2010151631A1 (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014018613A1 (fr) * 2012-07-25 2014-01-30 2nd Skull, LLC Protège-tête
US9032558B2 (en) 2011-05-23 2015-05-19 Lionhead Helmet Intellectual Properties, Lp Helmet system
EP2907403A1 (fr) * 2014-02-15 2015-08-19 Rex Medical, L.P. Casque avec absorption variable des chocs
EP2918184A1 (fr) * 2014-03-14 2015-09-16 Charles Owen & Company (Bow) Limited Casque
WO2015069800A3 (fr) * 2013-11-05 2015-11-05 University Of Washington Through Its Center For Commercialization Casques protecteurs pourvus d'éléments à déformation non linéaire
US20160242485A1 (en) * 2015-02-25 2016-08-25 Steven Christopher CARTON Helmet
US9924756B2 (en) 2013-12-09 2018-03-27 Stephen Craig Hyman Total contact helmet
US9961952B2 (en) 2015-08-17 2018-05-08 Bauer Hockey, Llc Helmet for impact protection
US10092057B2 (en) 2014-08-01 2018-10-09 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
US10306941B2 (en) 2011-07-27 2019-06-04 Bauer Hockey, Llc Sports helmet with rotational impact protection
US10362829B2 (en) 2013-12-06 2019-07-30 Bell Sports, Inc. Multi-layer helmet and method for making the same
US10413009B2 (en) 2014-02-15 2019-09-17 Rex Medical, L.P. Helmet with impact tracking
US10477909B2 (en) 2013-12-19 2019-11-19 Bauer Hockey, Llc Helmet for impact protection
US20200187583A1 (en) * 2015-12-11 2020-06-18 Bell Sports, Inc. Protective helmet with multiple energy management liners
US10721987B2 (en) 2014-10-28 2020-07-28 Bell Sports, Inc. Protective helmet
US10779600B2 (en) 2014-11-11 2020-09-22 The Uab Research Foundation Protective helmets having energy absorbing shells
US10813402B2 (en) 2015-03-23 2020-10-27 University Of Washington Protective helmets including non-linearly deforming elements
US10869520B1 (en) 2019-11-07 2020-12-22 Lionhead Helmet Intellectual Properties, Lp Helmet
US10874162B2 (en) 2011-09-09 2020-12-29 Riddell, Inc. Protective sports helmet
US10948898B1 (en) 2013-01-18 2021-03-16 Bell Sports, Inc. System and method for custom forming a protective helmet for a customer's head
USD927084S1 (en) 2018-11-22 2021-08-03 Riddell, Inc. Pad member of an internal padding assembly of a protective sports helmet
USD934505S1 (en) * 2019-01-28 2021-10-26 Cookie Composites Group Pty Ltd. Skydiving helmet
US11167198B2 (en) 2018-11-21 2021-11-09 Riddell, Inc. Football helmet with components additively manufactured to manage impact forces
US11178930B2 (en) 2014-08-01 2021-11-23 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
USD939151S1 (en) 2021-05-21 2021-12-21 Riddell, Inc. Visor for a football helmet
US11213736B2 (en) 2016-07-20 2022-01-04 Riddell, Inc. System and methods for designing and manufacturing a bespoke protective sports helmet
US11399589B2 (en) 2018-08-16 2022-08-02 Riddell, Inc. System and method for designing and manufacturing a protective helmet tailored to a selected group of helmet wearers
US11547166B1 (en) 2022-02-11 2023-01-10 Lionhead Helmet Intellectual Properties, Lp Helmet
US11641904B1 (en) 2022-11-09 2023-05-09 Lionhead Helmet Intellectual Properties, Lp Helmet
US12121095B1 (en) 2024-04-24 2024-10-22 Lionhead Helmet Intellectual Properties, Lp Helmet
US12446649B2 (en) 2023-03-24 2025-10-21 Federico Olivares Velasco Temperature regulating helmet system and methods thereof

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT2428129E (pt) * 2010-09-09 2013-06-24 Oliver Schimpf Capacete de protecção
AU2012276224B2 (en) 2011-06-30 2016-08-11 Simon Fraser University Impact diverting mechanism
US20130232668A1 (en) 2012-03-06 2013-09-12 Loubert S. Suddaby Helmet with multiple protective zones
US9980531B2 (en) 2012-03-06 2018-05-29 Loubert S. Suddaby Protective helmet with energy storage mechanism
US11278076B2 (en) 2012-03-06 2022-03-22 Loubert S. Suddaby Protective helmet with energy storage mechanism
US9795178B2 (en) 2012-03-06 2017-10-24 Loubert S. Suddaby Helmet with multiple protective zones
US10517347B2 (en) 2012-03-06 2019-12-31 Loubert S. Suddaby Helmet with multiple protective zones

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US20080066217A1 (en) * 2004-07-13 2008-03-20 Bart Depreitere Protective Helmet
US20080155735A1 (en) * 2005-02-16 2008-07-03 Xenith, Llc Energy-Absorbing Liners and Shape Conforming Layers for Use with Pro-Tective Headgear

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US6658671B1 (en) * 1999-12-21 2003-12-09 Neuroprevention Scandinavia Ab Protective helmet
US20010032351A1 (en) * 2000-04-04 2001-10-25 Kengo Nakayama Helmet
US20040168246A1 (en) * 2001-07-09 2004-09-02 Phillips Kenneth David Protective headgear and protective armour and a method of modifying protective headgear and protective armour
US20080066217A1 (en) * 2004-07-13 2008-03-20 Bart Depreitere Protective Helmet
US20080155735A1 (en) * 2005-02-16 2008-07-03 Xenith, Llc Energy-Absorbing Liners and Shape Conforming Layers for Use with Pro-Tective Headgear

Cited By (71)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9462840B2 (en) 2011-05-23 2016-10-11 Lionhead Helmet Intellectual Properties, Lp Helmet system
US9560892B2 (en) 2011-05-23 2017-02-07 Lionhead Helmet Intellectual Properties, Lp Helmet system
US9032558B2 (en) 2011-05-23 2015-05-19 Lionhead Helmet Intellectual Properties, Lp Helmet system
US9554608B2 (en) 2011-05-23 2017-01-31 Lionhead Helmet Intellectual Properties, Lp Helmet system
US9119433B2 (en) 2011-05-23 2015-09-01 Lionhead Helmet Intellectual Properties, Lp Helmet system
US9468248B2 (en) 2011-05-23 2016-10-18 Lionhead Helmet Intellectual Properties, Lp Helmet system
US10130133B2 (en) 2011-05-23 2018-11-20 Lionhead Helmet Intellectual Properties, Lp Helmet system
US10334904B2 (en) 2011-07-27 2019-07-02 Bauer Hockey, Llc Sports helmet with rotational impact protection
US10306941B2 (en) 2011-07-27 2019-06-04 Bauer Hockey, Llc Sports helmet with rotational impact protection
US10874162B2 (en) 2011-09-09 2020-12-29 Riddell, Inc. Protective sports helmet
US11311067B2 (en) 2011-09-09 2022-04-26 Riddell, Inc. Protective sports helmet
US11503872B2 (en) 2011-09-09 2022-11-22 Riddell, Inc. Protective sports helmet
WO2014018613A1 (fr) * 2012-07-25 2014-01-30 2nd Skull, LLC Protège-tête
US8997265B2 (en) 2012-07-25 2015-04-07 2nd Skull, LLC Head guard
US12471656B2 (en) 2013-01-18 2025-11-18 Bell Sports, Inc. System and method for forming protective sports equipment for a customer
US11419383B2 (en) 2013-01-18 2022-08-23 Riddell, Inc. System and method for custom forming a protective helmet for a customer's head
US10948898B1 (en) 2013-01-18 2021-03-16 Bell Sports, Inc. System and method for custom forming a protective helmet for a customer's head
US11889883B2 (en) 2013-01-18 2024-02-06 Bell Sports, Inc. System and method for forming a protective helmet for a customer's head
CN106413430A (zh) * 2013-11-05 2017-02-15 华盛顿大学商业中心 具有非线性变形元件的防护头盔
WO2015069800A3 (fr) * 2013-11-05 2015-11-05 University Of Washington Through Its Center For Commercialization Casques protecteurs pourvus d'éléments à déformation non linéaire
US10966479B2 (en) 2013-11-05 2021-04-06 University Of Washington Through Its Center For Commercialization Protective helmets with non-linearly deforming elements
US10362829B2 (en) 2013-12-06 2019-07-30 Bell Sports, Inc. Multi-layer helmet and method for making the same
US11871809B2 (en) 2013-12-06 2024-01-16 Bell Sports, Inc. Multi-layer helmet and method for making the same
US11291263B2 (en) 2013-12-06 2022-04-05 Bell Sports, Inc. Multi-layer helmet and method for making the same
US9924756B2 (en) 2013-12-09 2018-03-27 Stephen Craig Hyman Total contact helmet
US11425951B2 (en) 2013-12-19 2022-08-30 Bauer Hockey Llc Helmet for impact protection
US10477909B2 (en) 2013-12-19 2019-11-19 Bauer Hockey, Llc Helmet for impact protection
US12156561B2 (en) 2013-12-19 2024-12-03 Bauer Hockey Llc Helmet for impact protection
US10413009B2 (en) 2014-02-15 2019-09-17 Rex Medical, L.P. Helmet with impact tracking
US10327496B2 (en) 2014-02-15 2019-06-25 Rex Medical, L.P. Helmet with varying shock absorption
EP2907403A1 (fr) * 2014-02-15 2015-08-19 Rex Medical, L.P. Casque avec absorption variable des chocs
US11213088B2 (en) 2014-02-15 2022-01-04 Rex Medical, L.P. Helmet with varying shock absorption
US11375763B2 (en) 2014-02-15 2022-07-05 Rex Medical, L.P. Helmet with impact tracking
EP2918184A1 (fr) * 2014-03-14 2015-09-16 Charles Owen & Company (Bow) Limited Casque
US10212981B2 (en) 2014-03-14 2019-02-26 Charles Owen & Company (Bow) Limited Helmet
US12239181B2 (en) 2014-08-01 2025-03-04 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
US11178930B2 (en) 2014-08-01 2021-11-23 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
US11889880B2 (en) 2014-08-01 2024-02-06 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
US10092057B2 (en) 2014-08-01 2018-10-09 Carter J. Kovarik Helmet for reducing concussive forces during collision and facilitating rapid facemask removal
US11638457B2 (en) 2014-10-28 2023-05-02 Bell Sports, Inc. Protective helmet
US10721987B2 (en) 2014-10-28 2020-07-28 Bell Sports, Inc. Protective helmet
US10779600B2 (en) 2014-11-11 2020-09-22 The Uab Research Foundation Protective helmets having energy absorbing shells
US20160242485A1 (en) * 2015-02-25 2016-08-25 Steven Christopher CARTON Helmet
US10813402B2 (en) 2015-03-23 2020-10-27 University Of Washington Protective helmets including non-linearly deforming elements
US11638458B2 (en) 2015-08-17 2023-05-02 Bauer Hockey Llc Helmet for impact protection
US11089833B2 (en) 2015-08-17 2021-08-17 Bauer Hockey Llc Helmet for impact protection
US9961952B2 (en) 2015-08-17 2018-05-08 Bauer Hockey, Llc Helmet for impact protection
US12022905B2 (en) 2015-08-17 2024-07-02 Bauer Hockey Llc Helmet for impact protection
US20200187583A1 (en) * 2015-12-11 2020-06-18 Bell Sports, Inc. Protective helmet with multiple energy management liners
US20240398056A1 (en) * 2015-12-11 2024-12-05 Bell Sports, Inc. Protective helmet with multiple energy management liners
US12089685B2 (en) * 2015-12-11 2024-09-17 Bell Sports, Inc. Protective helmet with multiple energy management liners
US11213736B2 (en) 2016-07-20 2022-01-04 Riddell, Inc. System and methods for designing and manufacturing a bespoke protective sports helmet
US11712615B2 (en) 2016-07-20 2023-08-01 Riddell, Inc. System and method of assembling a protective sports helmet
US12478126B2 (en) 2018-08-16 2025-11-25 Riddell, Inc. System and method for testing a football helmet
US12268270B2 (en) 2018-08-16 2025-04-08 Riddell, Inc. Position specific protective sports helmet
US11399589B2 (en) 2018-08-16 2022-08-02 Riddell, Inc. System and method for designing and manufacturing a protective helmet tailored to a selected group of helmet wearers
US12059051B2 (en) 2018-08-16 2024-08-13 Riddell, Inc. System and method for designing and manufacturing a protective sports helmet
US11167198B2 (en) 2018-11-21 2021-11-09 Riddell, Inc. Football helmet with components additively manufactured to manage impact forces
US12303766B2 (en) 2018-11-21 2025-05-20 Riddell, Inc. Protective sports helmet with additively manufactured components
USD927084S1 (en) 2018-11-22 2021-08-03 Riddell, Inc. Pad member of an internal padding assembly of a protective sports helmet
USD986509S1 (en) 2019-01-28 2023-05-16 Cookie Composites Group Pty Ltd. Skydiving helmet
USD934505S1 (en) * 2019-01-28 2021-10-26 Cookie Composites Group Pty Ltd. Skydiving helmet
US11696612B2 (en) 2019-11-07 2023-07-11 Lionhead Helmet Intellectual Properties, Lp Helmet
US10869520B1 (en) 2019-11-07 2020-12-22 Lionhead Helmet Intellectual Properties, Lp Helmet
USD939151S1 (en) 2021-05-21 2021-12-21 Riddell, Inc. Visor for a football helmet
USD939782S1 (en) 2021-05-21 2021-12-28 Riddell, Inc. Visor for a football helmet
USD946833S1 (en) 2021-05-21 2022-03-22 Riddell, Inc. Visor for a football helmet
US11547166B1 (en) 2022-02-11 2023-01-10 Lionhead Helmet Intellectual Properties, Lp Helmet
US11641904B1 (en) 2022-11-09 2023-05-09 Lionhead Helmet Intellectual Properties, Lp Helmet
US12446649B2 (en) 2023-03-24 2025-10-21 Federico Olivares Velasco Temperature regulating helmet system and methods thereof
US12121095B1 (en) 2024-04-24 2024-10-22 Lionhead Helmet Intellectual Properties, Lp Helmet

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Legal Events

Date Code Title Description
AS Assignment

Owner name: WAYNE STATE UNIVERSITY, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KING, ALBERT I.;YANG, KING HAY;ZHANG, LIYING;SIGNING DATES FROM 20120217 TO 20120309;REEL/FRAME:028417/0055

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION