US3205312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Off-hook detector
Assignee: General Dynamics Corp
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Filing: 1960-12-23
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Granted: 1965-09-07
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Expires: 1980-12-23
Abstract
No abstract record available.
Inventors
- 👤 Brightman Barrie
- 👤 Jr J Carter Perkins
- 👤 Scott Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:01
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A SIGNAL RESPONSIVE CONTROL SYSTEM COMPRISING AT LEAST ONE FIRST CIRCUIT AND A SECOND CIRCUIT, A COMMON TRANSMISSION LINE, FIRST COUPLING MEANS FOR PERIODICALLY COUPLING SAID FIRST CIRCUIT TO ONE END OF SAID COMMON TRANSMISSION LINE, SECOND COUPLINGL MEANS FOR COUPLING SAID SECOND CIRCUIT AND AN ENERGY SOURCE TO THE OTHER END OF SAID TRANSMISSION LINE, SAID FIRST CIRCUIT INCLUDING AN IMPEDANCE ELEMENT WHICH IS SELECTIVELY ADJUSTABLE TO FIRST AND SECOND MUTUALLY EXCLUSIVE IMPEDANCE VALUES, TRANSFER MEANS IN SAID SECOND CIRCUIT FOR TRANSFERRING ELECTRICAL ENERGY FROM SAID ENERGY SOURCE OT SAID FIRST CIRCUIT AS IT IS PERIODICALLY COUPLED TO SAID TRANSMISSION LINE, SAID IMPEDANCE ELEMENT DISSIPATING BETWEEN SUCCES-
Claim 2
Dependent Claim
108 words
A SIGNAL RESPONSIVE CONTROL SYSTEM COMPRISING AT LEAST ONE FIRST CIRCUIT AND A SECOND CIRCUIT, A COMMON TRANSMISSION LINE, FIRST COUPLING MEANS FOR PERIODICALLY COUPLING SAID FIRST CIRCUIT TO ONE END OF SAID COMMON TRANSMISSION LINE, SECOND COUPLINGL MEANS FOR COUPLING SAID SECOND CIRCUIT AND AN ENERGY SOURCE TO THE OTHER END OF SAID TRANSMISSION LINE, SAID FIRST CIRCUIT INCLUDING AN IMPEDANCE ELEMENT WHICH IS SELECTIVELY ADJUSTABLE TO FIRST AND SECOND MUTUALLY EXCLUSIVE IMPEDANCE VALUES, TRANSFER MEANS IN SAID SECOND CIRCUIT FOR TRANSFERRING ELECTRICAL ENERGY FROM SAID ENERGY SOURCE OT SAID FIRST CIRCUIT AS IT IS PERIODICALLY COUPLED TO SAID TRANSMISSION LINE, SAID IMPEDANCE ELEMENT DISSIPATING BETWEEN SUCCES-
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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |