Patent US5396536A successfully refreshed from Google Patents.
Patent US3546573A successfully refreshed from Google Patents.
US3546573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage range limiting circuitry means
Assignee: Westinghouse Air Brake Co
•
Filing: 1968-04-30
•
Granted: 1970-12-08
•
Expires: 1988-04-30
Abstract
No abstract record available.
Inventors
- 👤 Rudolph A Coccia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:15
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2229432A
Cited
US2606544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |