Patent US3707965A successfully refreshed from Google Patents.
Patent US2817427A successfully refreshed from Google Patents.
US2817427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system
Assignee: Westinghouse Air Brake Co
•
Filing: 1955-11-14
•
Granted: 1957-12-24
•
Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Clark
- 👤 John H Hyler
- 👤 Fred S Whaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:49
CPC Classifications
B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/08; B61; B61J; B61J3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2615542A
Cited
US2712370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |