US3383475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone employing piezoresistive element
Assignee: Euphonics Corp
•
Filing: 1965-09-08
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Granted: 1968-05-14
•
Expires: 1985-09-08
Abstract
No abstract record available.
Inventors
- 👤 Alpha M Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:18
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A MICROPHONE COMPRISING: A SUPPORT; A TRANSDUCER INCLUDING A PIEZORESISTIVE ELEMENT; MEANS CONNECTING OPPOSITE ENDS OF SAID TRANSDUCER TO SAID SUPPORT IN FREE, SLIDABLE, FRICTIONAL ENGAGEMENT THEREWITH; AND MEANS FOR APPLYING BENDING FORCES TO SAID ELEMENT FOR CHANGING ITS ELECTRICAL RESISTANCE.
Claim 2
Dependent Claim
41 words
A MICROPHONE COMPRISING: A SUPPORT; A TRANSDUCER INCLUDING A PIEZORESISTIVE ELEMENT; MEANS CONNECTING OPPOSITE ENDS OF SAID TRANSDUCER TO SAID SUPPORT IN FREE, SLIDABLE, FRICTIONAL ENGAGEMENT THEREWITH; AND MEANS FOR APPLYING BENDING FORCES TO SAID ELEMENT FOR CHANGING ITS ELECTRICAL RESISTANCE.
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) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |