Patent US3483431A successfully refreshed from Google Patents.
US3483431A
Expired / Lapsed
US
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Counting and limiting type of resettable ground detection system for detecting electrical ground conditions
Assignee: Westinghouse Air Brake Co
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Filing: 1967-02-02
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Granted: 1969-12-09
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Expires: 1987-02-02
Abstract
No abstract record available.
Inventors
- 👤 Chalmers W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:09
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/06; H02H3/07
Claims Analysis
Total Claims: 0
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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) | 1972-12-08 | 1973-06-09 | 1973-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-08 | 1977-06-09 | 1977-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-08 | 1981-06-09 | 1981-12-09 | $7700.00 | Window Closed / Lapsed |