US3261915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional sound transmitter
Assignee: AKG Acoustics GmbH
•
Filing: 1962-05-17
•
Granted: 1966-07-19
•
Expires: 1982-05-17
Abstract
No abstract record available.
Inventors
- 👤 Gorike Rudolf
- 👤 Weingartner Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:31
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/406; H04R1/34; H04R1/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A DIRECTIONAL SOUND TRANSDUCER COMPRISING, IN COMBINATION, AT LEAST TWO CLOSEL ADJACENT CONDENSER MICROPHONES EACH INCLUDING DIAPHRAGM MEANS HAVING A FRONT FACE WITH A ZERO DEGREE SOUND WAVE INCIDENCE AND A REAR FACE WITH A 180* SOUND WAVE INCIDENCE, THE SOUND WAVES INCIDENT UPON THE REAR FACE OF EACH MICROPHONE INCIDENT PHASE DISPLACED WITH RESPECT TO THE SOUND WAVES INCIDENT UPON THE FRONT FACE OF THE RESPECTIVE DIAPHRAGM, WITH THE AMPLITUDE OF PHASE DISPLACEMENT DEPENDING SUBSTANTIALLY UPON THE SOUND DETOUR PATH WHICH SOUND WAVES, INCIDENT UPON THE FRONT FACE, MUST TRAVEL BETWEEN THE CENTER OF THE FRONT FACE AND THE CENTER OF THE REAR FACE, EACH MICROPHONE HAVING A RESPECTIVE OUTPUT; AND A COMMOND AMPLIFIER HAVING AN INPUT CONNECTED TO ALL OF SAID OUTPUTS; AT LEAST ONE OF SAID MICROPHONES CONSISTING OF A TREBLE CONDENSER MICROPHONE, AND AT LEAST ONE OTHER OF SAID MICROPHONES CONSISTING OF A BASS CONDENSER MICROPHONES; THE SOUND DETOUR PATH FROM THE CENTER OF THE FRONT FACE TO THE CENTER OF THE REAR FACE OF SAID DIAPHRAGM MEANS BEING SHORTER FOR SAID TREBLE MICROPHONE THAN FOR SAID BASS MICROPHONE.
Claim 2
Dependent Claim
183 words
A DIRECTIONAL SOUND TRANSDUCER COMPRISING, IN COMBINATION, AT LEAST TWO CLOSEL ADJACENT CONDENSER MICROPHONES EACH INCLUDING DIAPHRAGM MEANS HAVING A FRONT FACE WITH A ZERO DEGREE SOUND WAVE INCIDENCE AND A REAR FACE WITH A 180* SOUND WAVE INCIDENCE, THE SOUND WAVES INCIDENT UPON THE REAR FACE OF EACH MICROPHONE INCIDENT PHASE DISPLACED WITH RESPECT TO THE SOUND WAVES INCIDENT UPON THE FRONT FACE OF THE RESPECTIVE DIAPHRAGM, WITH THE AMPLITUDE OF PHASE DISPLACEMENT DEPENDING SUBSTANTIALLY UPON THE SOUND DETOUR PATH WHICH SOUND WAVES, INCIDENT UPON THE FRONT FACE, MUST TRAVEL BETWEEN THE CENTER OF THE FRONT FACE AND THE CENTER OF THE REAR FACE, EACH MICROPHONE HAVING A RESPECTIVE OUTPUT; AND A COMMOND AMPLIFIER HAVING AN INPUT CONNECTED TO ALL OF SAID OUTPUTS; AT LEAST ONE OF SAID MICROPHONES CONSISTING OF A TREBLE CONDENSER MICROPHONE, AND AT LEAST ONE OTHER OF SAID MICROPHONES CONSISTING OF A BASS CONDENSER MICROPHONES; THE SOUND DETOUR PATH FROM THE CENTER OF THE FRONT FACE TO THE CENTER OF THE REAR FACE OF SAID DIAPHRAGM MEANS BEING SHORTER FOR SAID TREBLE MICROPHONE THAN FOR SAID BASS MICROPHONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |