US3126448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Station
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
•
Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:14
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/6033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN AN INTERCOMMUNICATION TELEPHONE SYSTEM HAVING AT LEAST ONE STATION WITH A TRANSDUCER ARRANGED TO ACT AS A LOUDSPEAKER AND ALSO TO SERVE AS A MICROPHONE, THE COMBINATION AT SAID ONE STATION OF FIRST AND SECOND SEPARATE AMPLIFIERS, EACH WITH AN INPUT AND AN OUTPUT, FOR AMPLIFYING SPEECH SIGNALS IN THE INCOMING AND OUTGOING DIRECTIONS OF COMMUNICATION RESPECTIVELY, CIRCUIT MEANS WHICH SWITCHABLY CONNECT SAID TRANSDUCER ALTERNATIVELY TO THE OUTPUT OF SAID FIRST AMPLIFIER OF THE INPUT OF SAID SECOND AMPLIFIER, AND A RELAY OPERATIVELY COUPLED TO CIRCUIT MEANS TO CONNECT SAID TRANSDUCER ALTERNATIVELY TO ONE OR OTHER OF SAID TWO AMPLIFIERS, WHEREIN THE FIRST AMPLIFIER HAS AT LEAST ONE STAGE OPERATING AS A CLASS B AMPLIFIER, SAID ONE STAGE HAVING A LOAD IMPEDANCE, AND WHEREIN MEANS OPERATIVELY CONNECTED TO SAID RELAY ARE PROVIDED, WHICH MEANS ARE RESPONSIVE TO THE DIRECT PO-
Claim 2
Dependent Claim
141 words
IN AN INTERCOMMUNICATION TELEPHONE SYSTEM HAVING AT LEAST ONE STATION WITH A TRANSDUCER ARRANGED TO ACT AS A LOUDSPEAKER AND ALSO TO SERVE AS A MICROPHONE, THE COMBINATION AT SAID ONE STATION OF FIRST AND SECOND SEPARATE AMPLIFIERS, EACH WITH AN INPUT AND AN OUTPUT, FOR AMPLIFYING SPEECH SIGNALS IN THE INCOMING AND OUTGOING DIRECTIONS OF COMMUNICATION RESPECTIVELY, CIRCUIT MEANS WHICH SWITCHABLY CONNECT SAID TRANSDUCER ALTERNATIVELY TO THE OUTPUT OF SAID FIRST AMPLIFIER OF THE INPUT OF SAID SECOND AMPLIFIER, AND A RELAY OPERATIVELY COUPLED TO CIRCUIT MEANS TO CONNECT SAID TRANSDUCER ALTERNATIVELY TO ONE OR OTHER OF SAID TWO AMPLIFIERS, WHEREIN THE FIRST AMPLIFIER HAS AT LEAST ONE STAGE OPERATING AS A CLASS B AMPLIFIER, SAID ONE STAGE HAVING A LOAD IMPEDANCE, AND WHEREIN MEANS OPERATIVELY CONNECTED TO SAID RELAY ARE PROVIDED, WHICH MEANS ARE RESPONSIVE TO THE DIRECT PO-
References Cited (Backward Citations)
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Cited
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Cited
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Cited
US2819340A
Cited
US2951123A
Cited
US2964598A
Cited
US3050582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |