FR810939A - Perfectionnements aux microphones - Google Patents

Perfectionnements aux microphones

Info

Publication number: FR810939A
Authority: FR; France
Prior art keywords: refinements; microphone; microphone refinements
Prior art date: 1935-09-16
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.): Expired

Application number

Other languages

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.)

Associated Electric Laboratories Inc

Original Assignee

Associated Electric Laboratories Inc

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.)

1935-09-16

Filing date

1936-09-14

Publication date

1937-04-02

1936-09-14 Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc

1937-04-02 Application granted granted Critical

1937-04-02 Publication of FR810939A publication Critical patent/FR810939A/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Measuring Fluid Pressure (AREA)
Telephone Set Structure (AREA)

FR810939D 1935-09-16 1936-09-14 Perfectionnements aux microphones Expired FR810939A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US40738A US2149628A (en)	1935-09-16	1935-09-16	Telephone transmitter

Publications (1)

Publication Number	Publication Date
FR810939A true FR810939A (fr)	1937-04-02

Family

ID=21912660

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR810939D Expired FR810939A (fr)	1935-09-16	1936-09-14	Perfectionnements aux microphones

Country Status (3)

Country	Link
US (1)	US2149628A (fr)
FR (1)	FR810939A (fr)
GB (1)	GB479469A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
NL70171C (fr) *	1947-08-06
US2567368A (en) *	1949-06-09	1951-09-11	Bell Telephone Labor Inc	Telephone transmitter
BE547497A (fr) *	1955-06-02

1935
- 1935-09-16 US US40738A patent/US2149628A/en not_active Expired - Lifetime
1936
- 1936-08-07 GB GB21822/36A patent/GB479469A/en not_active Expired
- 1936-09-14 FR FR810939D patent/FR810939A/fr not_active Expired

Also Published As

Publication number	Publication date
US2149628A (en)	1939-03-07
GB479469A (en)	1938-02-07

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