Patent US3283073A successfully refreshed from Google Patents.
US3283073A
Expired / Lapsed
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Intercommunication system and eavesdropping preventing means therefor
Assignee: Webster Electric Co Inc
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Filing: 1962-11-30
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Granted: 1966-11-01
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Expires: 1982-11-30
Abstract
No abstract record available.
Inventors
- 👤 Richard H Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:47
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A SIGNALING SYSTEM, BIDIRECTIONAL AMPLIFYING MEANS PROVIDING A HIGH LEVEL ALTERNATING CURRENT OUTPUT SIGNAL, STATION MEANS INCLUDING A BILATERAL ELECTROACOUSTICAL TANSDUCER PROVIDING A LOW LEVEL ALTERNATING CURRENT OUTPUT SIGNAL, AND A SIGNALING CHANNEL CONNECTED BETWEEN THE AMPLIFYING MEANS AND THE STATION MEANS FOR TRANSMITTING HIGH LEVEL SIGNALS FROM THE AMPLIFYING MEANS TO THE TRANSDUCER AND FOR PREVENTING THE TRANSMISSION OF LOW LEVEL SIGNALS FROM THE TRANSDUCER TO THE AMPLIFYING MEANS, SAID CHANNEL INCLUDING TWO PAIR OF OPPOSITELY POLED AND PARALLEL CONNECTED DIODES, THE PAIRS BEING CONNECTED IN SERIES AT A POINT OF CONNECTION.
Claim 2
Dependent Claim
94 words
IN A SIGNALING SYSTEM, BIDIRECTIONAL AMPLIFYING MEANS PROVIDING A HIGH LEVEL ALTERNATING CURRENT OUTPUT SIGNAL, STATION MEANS INCLUDING A BILATERAL ELECTROACOUSTICAL TANSDUCER PROVIDING A LOW LEVEL ALTERNATING CURRENT OUTPUT SIGNAL, AND A SIGNALING CHANNEL CONNECTED BETWEEN THE AMPLIFYING MEANS AND THE STATION MEANS FOR TRANSMITTING HIGH LEVEL SIGNALS FROM THE AMPLIFYING MEANS TO THE TRANSDUCER AND FOR PREVENTING THE TRANSMISSION OF LOW LEVEL SIGNALS FROM THE TRANSDUCER TO THE AMPLIFYING MEANS, SAID CHANNEL INCLUDING TWO PAIR OF OPPOSITELY POLED AND PARALLEL CONNECTED DIODES, THE PAIRS BEING CONNECTED IN SERIES AT A POINT OF CONNECTION.
References Cited (Backward Citations)
US2577792A
Cited
US2322833A
Cited
US2841647A
Cited
US3050582A
Cited
US3175045A
Cited
US3145266A
Cited
US3215789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |