US3307168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signalling system
Assignee: General Precision Inc
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Filing: 1962-11-19
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Granted: 1967-02-28
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Expires: 1982-11-19
Abstract
No abstract record available.
Inventors
- 👤 John F Zaleski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:22
CPC Classifications
B; B61; B61L; B61L25/00; B61L25/02; B61L25/04; B61L25/043
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A SIGNALLING SYSTEM COMPRISING (A) A MOVABLE STATION INCLUDING MEANS SELECTIVELY OPERABLE TO TRANSMIT INFORMATION SIGNALS AT A PLURALITY OF DISCRETE FREQUENCIES LYING WITHIN A PREDETERMINED FREQUENCY RANGE; (B) A FIXED STATION INCLUDING MEANS FOR RECEIVING INFORMATION SIGNALS WITHIN SAID FREQUENCY RANGE; AND (C) MEANS FOR OPERATING SAID SELECTIVELY OPERABLE MEANS OF SAID MOVABLE STATION INCLUDING MEANS POSITIONED ADJACENT SAID FIXED STATION FOR PROVIDING A PREDETERMINED TIME-INVARIANT MAGNETIC FIELD IN THE PATH OF SAID MOVABLE STATION.
References Cited (Backward Citations)
US3040247A
Cited
US3205352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |