Patent US3136864A successfully refreshed from Google Patents.
US3136864A
Expired / Lapsed
US
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Loudspeaking telephone with electronic voice switching
Assignee: Automatic Electric Laboratories Inc
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Filing: 1959-10-05
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Granted: 1964-06-09
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Expires: 1979-10-05
Abstract
No abstract record available.
Inventors
- 👤 Robert T Cleary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08; H04M9/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
119 words
IN A TELEPHONE SYSTEM HAVING A TRANSMITTING CHANNEL AND A RECEIVING CHANNEL, A CONTROL CIRCUIT HAVING AN INPUT END AND AN OUTPUT END, TWO INPUT CONNECTIONS RESPECTIVELY EXTENDING FROM SAID TWO CHANNELS AND DIFFERENTIALLY CONNECTED TO SAID INPUT END, AND TWO OUTPUT CONNECTIONS RESPECTIVELY EXTENDING TO SAID CHANNELS FROM SAID OUTPUT END, SAID CONTROL CIRCUIT COMPRISING A DIODE-CAPACITANCE BRIDGE ARRANGEMENT INCLUDING A PAIR OF CAPACITANCE LEGS COMMON TO BOTH SAID CHANNELS AND TWO PAIRS OF DIODE LEGS FOR CONTROL OF SAID TRANSMITTING CHANNEL AND SAID RECEIVING CHANNEL RESPECTIVELY, SAID TWO PAIR OF DIODE LEGS RESPECTIVELY CAUSING THE SERIES IMPEDANCE OF ONE OF SAID CHANNELS AND THE SHUNT IMPEDANCE OF THE OTHER SAID CHANNEL TO VARY IN THE SAME SENSE.
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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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |