Patent US3215780A successfully refreshed from Google Patents.
US3215780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaking intercommunication systems
Assignee: International Standard Electric Corp
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Filing: 1962-03-22
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Granted: 1965-11-02
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Expires: 1982-03-22
Abstract
No abstract record available.
Inventors
- 👤 Beszedics Geza
- 👤 Konecny Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:25
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
AN INTERCOMMUNCIATION SYSTEM COMPRISING A PLURAILITY OF STATIONS, COMMUNICATION LINES INTERCONNECTING PAIRS OF SAID STATIONS, A MICROPHONE AND A LOUDSPEAKER AT EACH OF SAID STATIONS, EACH OF SAID LINES COMPRISING SWITCH MENS FOR CONNECTING THE MICROPHONE OF EITHER ONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF THE OTHER ONE OF SAID PAIR OF STATIONS, OSCILLATOR MEANS FOR GENERATING SWITCH CONTROL SIGNALS WHICH RECUR AT A FREQUENCY NO GREATER THAN THE COMMUNICATION FREQUENCY OF SAID SYSTEM, SWITCH CONTROL MEANS OPERATED RESPONSIVE TO SID GENERATED SIGNALS FOR CAUSING SAID SWITCH MEANS TO ALTERNATIVELY CONNECT THE MICROPHONE OF ONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF THE OTHER OF SID PAIR OF STATIONS AND THE MICROPHONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF SAID ONE OF SAID STATIONS, RECTIFIER MEANS CONNECTED BETWEEN SAID LOUDSPEAKERS FOR
Claim 2
Dependent Claim
138 words
AN INTERCOMMUNCIATION SYSTEM COMPRISING A PLURAILITY OF STATIONS, COMMUNICATION LINES INTERCONNECTING PAIRS OF SAID STATIONS, A MICROPHONE AND A LOUDSPEAKER AT EACH OF SAID STATIONS, EACH OF SAID LINES COMPRISING SWITCH MENS FOR CONNECTING THE MICROPHONE OF EITHER ONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF THE OTHER ONE OF SAID PAIR OF STATIONS, OSCILLATOR MEANS FOR GENERATING SWITCH CONTROL SIGNALS WHICH RECUR AT A FREQUENCY NO GREATER THAN THE COMMUNICATION FREQUENCY OF SAID SYSTEM, SWITCH CONTROL MEANS OPERATED RESPONSIVE TO SID GENERATED SIGNALS FOR CAUSING SAID SWITCH MEANS TO ALTERNATIVELY CONNECT THE MICROPHONE OF ONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF THE OTHER OF SID PAIR OF STATIONS AND THE MICROPHONE OF SAID PAIR OF STATIONS TO THE LOUDSPEAKER OF SAID ONE OF SAID STATIONS, RECTIFIER MEANS CONNECTED BETWEEN SAID LOUDSPEAKERS FOR
References Cited (Backward Citations)
US2427850A
Cited
US2702319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |