Patent US3098122A successfully refreshed from Google Patents.
US3098122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for an intercom system with alternative operation
Assignee: International Standard Electric Corp
•
Filing: 1961-02-08
•
Granted: 1963-07-16
•
Expires: 1981-02-08
Abstract
No abstract record available.
Inventors
- 👤 Knauer Hans-Ulrich
- 👤 Vogel Georg
- 👤 Bayer Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:34
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
AN INTERCOMMUNICATING SYSTEM COMPRISING A MASTER STATION AND A REMOTE STATION INTERCONNECTED BY A THREEWIRE TRANSMISSION LINE, TRANSDUCER MEANS IN EACH STATION FOR TRANSMITTING AND RECEIVING SPEECH SIGNALS, AMPLIFIER MEANS IN SAID MASTER STATION FOR AMPLIFYING SAID SPEECH SIGNALS FROM EACH OF SAID TRANSSUCER MEANS, SWITCH MEANS IN SAID MASTER STATION HAVING A FIST POSITION FOR CONNECTEDING THE ASSOCIATED TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS AND FOR CONNECTING THE TRANSDUCER MEANS OF SAID REMOTE STATION TO THE INPUT OF SAID AMPLIFYING MEANS AND HAVING A SECOND POSITION FOR REVERSING THE LAST SAID CONNECTIONS, AND SWITCH MEANS IN SAID REMOTE STATION HAVING A FIRST POSITION FOR CONNECTING THE ASSOCIATED TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS WHEN SAIDMASTER STATION SWITCH MEANS IS IN ITS SAID FIRST POSITION AND HAVING A SECOND POSITION FOR CONNECTING THE ASSOCIATED TRANSDUCER MEANS TO THE INPUT OF SAID AMPLIFYING MEANS WHIEN SAID MASTER STATION SWITCH MEANS IS IN ITS SAID FIRST POSITION AND FOR CONNECTING THE LAST-SAID TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS WHEN SAID MASTER STATION SWITCH MEANS IS IN ITS SAID SECOND POSITION.
Claim 2
Dependent Claim
187 words
AN INTERCOMMUNICATING SYSTEM COMPRISING A MASTER STATION AND A REMOTE STATION INTERCONNECTED BY A THREEWIRE TRANSMISSION LINE, TRANSDUCER MEANS IN EACH STATION FOR TRANSMITTING AND RECEIVING SPEECH SIGNALS, AMPLIFIER MEANS IN SAID MASTER STATION FOR AMPLIFYING SAID SPEECH SIGNALS FROM EACH OF SAID TRANSSUCER MEANS, SWITCH MEANS IN SAID MASTER STATION HAVING A FIST POSITION FOR CONNECTEDING THE ASSOCIATED TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS AND FOR CONNECTING THE TRANSDUCER MEANS OF SAID REMOTE STATION TO THE INPUT OF SAID AMPLIFYING MEANS AND HAVING A SECOND POSITION FOR REVERSING THE LAST SAID CONNECTIONS, AND SWITCH MEANS IN SAID REMOTE STATION HAVING A FIRST POSITION FOR CONNECTING THE ASSOCIATED TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS WHEN SAIDMASTER STATION SWITCH MEANS IS IN ITS SAID FIRST POSITION AND HAVING A SECOND POSITION FOR CONNECTING THE ASSOCIATED TRANSDUCER MEANS TO THE INPUT OF SAID AMPLIFYING MEANS WHIEN SAID MASTER STATION SWITCH MEANS IS IN ITS SAID FIRST POSITION AND FOR CONNECTING THE LAST-SAID TRANSDUCER MEANS TO THE OUTPUT OF SAID AMPLIFYING MEANS WHEN SAID MASTER STATION SWITCH MEANS IS IN ITS SAID SECOND POSITION.
References Cited (Backward Citations)
US2162369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |