Patent US3189885A successfully refreshed from Google Patents.
US3189885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coded detecting systems
Assignee: Westinghouse Air Brake Co
•
Filing: 1961-07-10
•
Granted: 1965-06-15
•
Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Charles B Shields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:56
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/02; B61L1/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
A DETECTING SYSTEM FOR OBJECTS TRAVERSING A DETECTION ZONE AND COMPRISING, AN OSCILLATOR, A PLURALITY OF INDUCTORS ARRANGED IN A RETURN ENERGY PATH FOR SAID OSCILLATOR AND BEING SO INDUCTIVELY COUPLED WITH EACH OTHER THAT NORMALLY SAID OSCILLATOR IS QUIESCENT, SAID INDUCTORS BEING ARRANGED IN SAID DETECTION ZONE AND HAVING THEIR COUPLING INCREASED BY OBJECTS IN THE ZONE TO A DEGREE SUFFICIENT TO INDUCE OSCILLATION IN SAID OSCILLATOR, AND INDUCTOR MEANS FOR INDUCTIVELY COUPLING SAID FIRST AND SECOND COILS ALTERNATELY AT A RECURRING RATE WHEREBY THE OSCILLATION IN SAID OSCILLATOR OCCURS AT A CORRESPONDING RATE.
References Cited (Backward Citations)
US2537298A
Cited
US2454687A
Cited
US2692942A
Cited
US2753550A
Cited
US2966582A
Cited
US3004149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |