BE402491A - - Google Patents

Info

Publication number: BE402491A
Authority: BE; Belgium

Application number

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.)

1933-05-11

Publication of BE402491A publication Critical patent/BE402491A/xx

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)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Telephone Set Structure (AREA)
Details Of Audible-Bandwidth Transducers (AREA)

BE402491D 1933-05-11 BE402491A (xx)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US670406A US2042822A (en)	1933-05-11	1933-05-11	Telephone transmitter

Publications (1)

Publication Number	Publication Date
BE402491A true BE402491A (xx)

Family

ID=24690278

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE402491D BE402491A (xx)	1933-05-11

Country Status (5)

Country	Link
US (1)	US2042822A (xx)
BE (1)	BE402491A (xx)
DE (1)	DE642693C (xx)
FR (1)	FR771454A (xx)
GB (1)	GB435130A (xx)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE757629C (de) *	1938-09-09	1953-01-19	Lorenz C Ag	Querstrommikrofon
DE740642C (de) *	1941-01-25	1943-10-25	Kabelindustrie Ag	Kapselmikrofon mit einem aus Isolierstoff bestehenden Kapselgehaeuse
US2431022A (en) *	1942-12-21	1947-11-18	Kellogg Switchboard & Supply	Telephone transmitter
BE468390A (xx) *	1943-12-28
BE482597A (xx) *	1944-08-15
US2494704A (en) *	1945-09-01	1950-01-17	Bell Telephone Labor Inc	Microphone with fuse
US2538026A (en) *	1946-05-07	1951-01-16	Univ Loudspeakers Inc	Electroacoustic transducer for actuating loud speakers
US2527159A (en) *	1947-04-26	1950-10-24	Bell Telephone Labor Inc	Telephone transmitter with radial slots in the carbon chamber
NL70196C (xx) *	1947-10-31
US2532741A (en) *	1947-10-31	1950-12-05	Bell Telephone Labor Inc	Microphone with opposite electrodes being of varying and constant curvature
US2609458A (en) *	1948-01-16	1952-09-02	Vigren Sten Daniel	Telephone apparatus
US2585052A (en) *	1948-04-23	1952-02-12	Int Standard Electric Corp	Granule type acoustic transducer
US2819351A (en) *	1955-07-21	1958-01-07	Robin Hood Co	Microphone

0
- BE BE402491D patent/BE402491A/xx unknown
1933
- 1933-05-11 US US670406A patent/US2042822A/en not_active Expired - Lifetime
1934
- 1934-03-16 GB GB8348/34A patent/GB435130A/en not_active Expired
- 1934-04-09 FR FR771454D patent/FR771454A/fr not_active Expired
- 1934-05-12 DE DEI49678D patent/DE642693C/de not_active Expired

Also Published As

Publication number	Publication date
FR771454A (fr)	1934-10-09
GB435130A (en)	1935-09-16
US2042822A (en)	1936-06-02
DE642693C (de)	1937-03-12

Publication	Publication Date	Title
FR742388A (xx)	1933-03-04
FR743159A (xx)	1933-03-25
FR742904A (xx)	1933-03-18
BE369770A (xx)
BE375476A (xx)
BE378380A (xx)
BE389595A (xx)
BE391463A (xx)
BE393645A (xx)
BE393793A (xx)
BE393878A (xx)
BE393996A (xx)
BE394022A (xx)	1933-02-28
BE394067A (xx)	1933-03-31
BE394072A (xx)
BE394093A (xx)
BE394103A (xx)
BE394207A (xx)	1933-03-31
BE394212A (xx)
BE394300A (xx)	1933-03-31
BE394347A (xx)
BE394392A (xx)
BE394410A (xx)
BE394468A (xx)
BE394486A (xx)