Patent US3975763A successfully refreshed from Google Patents.
US3439128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature ceramic microphone
Assignee: Zenith Electronics LLC
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Filing: 1966-05-16
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Granted: 1969-04-15
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Ilyitch J Sobel
- 👤 Witalij Didyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A MINIATURE MICROPHONE FOR USE IN HEARING AIDS AND THE LIKE COMPRISING: A HOUSING HAVING A SOUND WAVE ADMITTING APERTURE; A DIAPHRAGM PERIPHERALLY SECURED TO SAID HOUSING ADJACENT THE APERTURE; A BIMORPH ELEMENT SECURED INTERMEDIATE ITS ENDS TO SAID DIAPHRAGM, SAID ELEMENT COMPRISING A PAIR OF OPPOSITELY POLARIZED CERAMIC WAFERS HAVING FIRST AND SECOND ELECTRODES ON EACH OF THE RESPECTIVE OUTER FACES OF SAID WAFERS AND A THIRD ELECTRODE BETWEEN AND CONTACTING BOTH OF THE INNER FACES OF SAID WAFERS; AND A PAIR OF ELECTRICALLY CONDUCTIVE SUPPORTS DISPOSED AT THE ENDS OF SAID ELEMENT FOR SUPPORTING THE LATTER, ONE OF SAID SUPPORTS ELECTRICALLY CONTACTING SAID FIRST AND SECOND ELECTRODES AND INSULATED FROM THE THIRD ELECTRODE AND THE OTHER OF SAID SUPPORTS ELECTRICALLY CONTACTING SAID THIRD ELECTRODE AND INSULATED FROM THE FIRST AND SECOND ELECTRODES, SAID SUPPORTS HAVING A PAIR OF OUTPUT TERMINALS FORMED THEREON AND EXTENDING THROUGH SAID HOUSING.
Claim 2
Dependent Claim
149 words
A MINIATURE MICROPHONE FOR USE IN HEARING AIDS AND THE LIKE COMPRISING: A HOUSING HAVING A SOUND WAVE ADMITTING APERTURE; A DIAPHRAGM PERIPHERALLY SECURED TO SAID HOUSING ADJACENT THE APERTURE; A BIMORPH ELEMENT SECURED INTERMEDIATE ITS ENDS TO SAID DIAPHRAGM, SAID ELEMENT COMPRISING A PAIR OF OPPOSITELY POLARIZED CERAMIC WAFERS HAVING FIRST AND SECOND ELECTRODES ON EACH OF THE RESPECTIVE OUTER FACES OF SAID WAFERS AND A THIRD ELECTRODE BETWEEN AND CONTACTING BOTH OF THE INNER FACES OF SAID WAFERS; AND A PAIR OF ELECTRICALLY CONDUCTIVE SUPPORTS DISPOSED AT THE ENDS OF SAID ELEMENT FOR SUPPORTING THE LATTER, ONE OF SAID SUPPORTS ELECTRICALLY CONTACTING SAID FIRST AND SECOND ELECTRODES AND INSULATED FROM THE THIRD ELECTRODE AND THE OTHER OF SAID SUPPORTS ELECTRICALLY CONTACTING SAID THIRD ELECTRODE AND INSULATED FROM THE FIRST AND SECOND ELECTRODES, SAID SUPPORTS HAVING A PAIR OF OUTPUT TERMINALS FORMED THEREON AND EXTENDING THROUGH SAID HOUSING.
References Cited (Backward Citations)
US1649081A
Cited
US2411146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |