Patent US3300585A successfully refreshed from Google Patents.
US3300585A
Expired / Lapsed
US
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Self-polarized electrostatic microphone-semiconductor amplifier combination
Assignee: Nortel Networks Ltd
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Filing: 1963-10-01
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Granted: 1967-01-24
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Expires: 1983-10-01
Abstract
No abstract record available.
Inventors
- 👤 Reedyk Cornelis Wilfred
- 👤 Fatovic Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:01
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/01; H04R19/016; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F3/185; H03F3/1855; H04R19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN COMBINATION, A SELF-POLARIZED ELECTROSTATIC MICROPHONE AND A SEMICONDUCTOR AMPLIFIER HAVING ITS INPUT ELECTRICALLY COUPLED TO SAID MICROPHONE, SAID MICROPHONE BEING ARRANGED TO HAVE ITS ELECTRICAL IMPEDANCE, AND SAID AMPLIFIER BEING ARRANGED TO HAVE ITS INPUT IMPEDANCE, OF SUCH VALUES SO AS TO PRODUCE EFFECTIVE ELECTRICAL COUPLING THEREBETWEEN.
Claim 2
Dependent Claim
48 words
IN COMBINATION, A SELF-POLARIZED ELECTROSTATIC MICROPHONE AND A SEMICONDUCTOR AMPLIFIER HAVING ITS INPUT ELECTRICALLY COUPLED TO SAID MICROPHONE, SAID MICROPHONE BEING ARRANGED TO HAVE ITS ELECTRICAL IMPEDANCE, AND SAID AMPLIFIER BEING ARRANGED TO HAVE ITS INPUT IMPEDANCE, OF SUCH VALUES SO AS TO PRODUCE EFFECTIVE ELECTRICAL COUPLING THEREBETWEEN.
References Cited (Backward Citations)
US2024705A
Cited
US2857462A
Cited
US2875285A
Cited
US3118979A
Cited
US3210677A
Cited
US3218395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |