Patent US3147345A successfully refreshed from Google Patents.
US3147345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gain selective telephone set
Assignee: AT&T Inc
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Filing: 1961-04-26
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Granted: 1964-09-01
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 Busala Alessandro
- 👤 John E Linse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:11
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A COMMUNICATION SYSTEM COMPRISING, IN COMBINATION, A TELEPHONE SET, FIRST AND SECOND SPEECH CIRCUIT MEANS INCLUDED IN SAID SET, A TELEPHONE LINE, AN AMPLIFYING DEVICE HAVING A PLURALITY OF ELECTRODES, SWITCHING MEANS FOR SELECTIVELY SWITCHING EACH OF SAID SPEECH CIRCUITS ACROSS AN IDENTICAL PAIR OF SAID ELECTRODES, MEANS RESPONSIVE TO SAID SWITCHING MEANS FOR CONNECTING EITHER OF TWO DIFFERENT PAIRS OF SAID ELECTRODES TO SAID TELEPHONE LINE ACCORDING TO THE PARTICULAR ONE OF SAID SPEECH CIRCUITS THAT IS CONNECTED ACROSS SAID IDENTICAL PAIR OF SAID ELECTRODES, THEREBY TO PROVIDE A DIFFERENT AMPLIFICATION FACTOR FOR EACH OF SAID SPEECH CIRCUITS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |