Patent US2989971A successfully refreshed from Google Patents.
US2989971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tripper valve
Assignee: Bendix Westinghouse Automotive Air Brake Co
•
Filing: 1957-02-04
•
Granted: 1961-06-27
•
Expires: 1977-02-04
Abstract
No abstract record available.
Inventors
- 👤 Harry M Valentine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:47
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/024; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7738; Y10T137/774; Y10T137/7781; Y10T137/7835
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2680447A
Cited
US1726102A
Cited
US2488949A
Cited
GB707165A
Cited
US2764174A
Cited
US2860662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |