Patent US3278696A successfully refreshed from Google Patents.
US3278696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor microphone
Assignee: AT&T Inc
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Filing: 1963-06-12
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Granted: 1966-10-11
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Expires: 1983-06-12
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:07
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN ELECTROMECHANICAL TRANSDUCER COMPRISING A TRANSISTOR HAVING A THREE-DIMENSIONAL EMITTER REGION, A THREEDIMENSIONAL BASE REGION, A P-N JUNCTION BETWEEN SAID EMITTER AND BASE REGIONS ENVELOPING ALL BUT AN OUTER SURFACE OF SAID EMITTER REGION, AN INDENTER IMPINGING NORMALLY UPON THE OUTER SURFACE OF THE EMITTER REGION AT A POINT CLOSELY ADJACENT AN EDGE OF THE OUTER SURFACE OF SAID EMITTER REGION, MEANS FOR EXERTING A SPECIFIC STATIC FORCE LONGITUDINALLY THROUGH THE INDENTER AT SAID POINT, AND MEANS FOR EXERTING A VIBRATORY MECHANICAL SIGNAL
Claim 2
Dependent Claim
83 words
AN ELECTROMECHANICAL TRANSDUCER COMPRISING A TRANSISTOR HAVING A THREE-DIMENSIONAL EMITTER REGION, A THREEDIMENSIONAL BASE REGION, A P-N JUNCTION BETWEEN SAID EMITTER AND BASE REGIONS ENVELOPING ALL BUT AN OUTER SURFACE OF SAID EMITTER REGION, AN INDENTER IMPINGING NORMALLY UPON THE OUTER SURFACE OF THE EMITTER REGION AT A POINT CLOSELY ADJACENT AN EDGE OF THE OUTER SURFACE OF SAID EMITTER REGION, MEANS FOR EXERTING A SPECIFIC STATIC FORCE LONGITUDINALLY THROUGH THE INDENTER AT SAID POINT, AND MEANS FOR EXERTING A VIBRATORY MECHANICAL SIGNAL
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |