Patent US3588360A successfully refreshed from Google Patents.
US3588360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telecommunication systems
Assignee: Post Office
•
Filing: 1969-02-03
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Granted: 1971-06-28
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Expires: 1989-02-03
Abstract
Abstract THE EFFECT OF HIGH LEVEL BACKGROUND NOISE ON A LOUD-SPEAKING TELEPHONE SET IS MINIMIZED BY PROVIDING A MICROPHONE POSITIONED TO PICK UP THE BACKGROUND NOISE AND AN OUTPUT WHICH IS USED TO CONTROL THE GAIN OF A RECEIVE AMPLIFIER AND THE THRESHOLD LEVEL OF A VOICE-OPERATED SEND SPEECH GATE IN THE TELEPHONE SET.
Inventors
- 👤 Keith Anthony Thomas Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:12
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08; H04M9/10
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |