Patent US3336442A successfully refreshed from Google Patents.
US3336442A
Expired / Lapsed
US
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Trunk switching circuitry
Assignee: AT&T Inc
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Filing: 1964-06-09
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Granted: 1967-08-15
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Expires: 1984-06-09
Abstract
No abstract record available.
Inventors
- 👤 Russell C Casterline
- 👤 Jr Leopold F Goeller
- 👤 John M Nervik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN COMBINATION, A COMMUNICATION STATION, A TRUNK CIRCUIT HAVING A PAIR OF INPUT CONDUCTORS, MEANS FOR CONNECTING SAID STATION TO SAID CONDUCTORS, SAID CIRCUIT FURTHER HAVING AN OUTPUT PAIR OF CONDUCTORS AND SWITCHING MEANS RESPONSIVE TO THE RECEIPT OF A FIRST ELECTRICAL SIGNAL FOR ESTABLISHING METALLIC CONNECTIONS BETWEEN SAID INPUT AND OUTPUT CONDUCTORS, AND A DIGIT TRANSMITTER FOR TRANSMITTING ELECTRICAL DIGIT SIGNALS TO SAID INPUT CONDUCTORS FOR TRANSMISSION TO SAID OUTPUT CONDUCTORS, AN ELECTRICAL
Claim 2
Dependent Claim
74 words
IN COMBINATION, A COMMUNICATION STATION, A TRUNK CIRCUIT HAVING A PAIR OF INPUT CONDUCTORS, MEANS FOR CONNECTING SAID STATION TO SAID CONDUCTORS, SAID CIRCUIT FURTHER HAVING AN OUTPUT PAIR OF CONDUCTORS AND SWITCHING MEANS RESPONSIVE TO THE RECEIPT OF A FIRST ELECTRICAL SIGNAL FOR ESTABLISHING METALLIC CONNECTIONS BETWEEN SAID INPUT AND OUTPUT CONDUCTORS, AND A DIGIT TRANSMITTER FOR TRANSMITTING ELECTRICAL DIGIT SIGNALS TO SAID INPUT CONDUCTORS FOR TRANSMISSION TO SAID OUTPUT CONDUCTORS, AN ELECTRICAL
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |