BE468390A - - Google Patents
Info
- Publication number
- BE468390A BE468390A BE468390DA BE468390A BE 468390 A BE468390 A BE 468390A BE 468390D A BE468390D A BE 468390DA BE 468390 A BE468390 A BE 468390A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measuring Fluid Pressure (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US515880A US2429988A (en) | 1943-12-28 | 1943-12-28 | Temperature compensated microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE468390A true BE468390A (https=) |
Family
ID=24053153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE468390D BE468390A (https=) | 1943-12-28 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2429988A (https=) |
| BE (1) | BE468390A (https=) |
| CH (1) | CH258724A (https=) |
| ES (1) | ES175771A1 (https=) |
| FR (1) | FR938802A (https=) |
| GB (1) | GB590572A (https=) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL70196C (https=) * | 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 |
| US2585052A (en) * | 1948-04-23 | 1952-02-12 | Int Standard Electric Corp | Granule type acoustic transducer |
| NL111663C (https=) * | 1956-10-11 | |||
| DE1230858B (de) * | 1960-06-22 | 1966-12-22 | Siemens Ag | Membran fuer einen elektroakustischen Wandler |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1570120A (en) * | 1923-12-06 | 1926-01-19 | Western Electric Co | Telephone device |
| US1603300A (en) * | 1924-09-02 | 1926-10-19 | Western Electric Co | Telephone transmitter |
| US2069242A (en) * | 1933-01-19 | 1937-02-02 | George A Graham | Electroacoustic energy converting system |
| BE402491A (https=) * | 1933-05-11 | |||
| US2179733A (en) * | 1934-11-27 | 1939-11-14 | Siemens Brothers & Co Ltd | Microphone |
-
0
- BE BE468390D patent/BE468390A/xx unknown
-
1943
- 1943-12-28 US US515880A patent/US2429988A/en not_active Expired - Lifetime
-
1944
- 1944-12-22 GB GB25828/44A patent/GB590572A/en not_active Expired
-
1946
- 1946-09-17 CH CH258724D patent/CH258724A/fr unknown
- 1946-11-06 ES ES175771A patent/ES175771A1/es not_active Expired
- 1946-11-19 FR FR938802D patent/FR938802A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR938802A (fr) | 1948-10-26 |
| GB590572A (en) | 1947-07-22 |
| US2429988A (en) | 1947-11-04 |
| CH258724A (fr) | 1948-12-15 |
| ES175771A1 (es) | 1947-01-01 |