US1991902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1930-11-13
•
Granted: 1935-02-19
•
Expires: 1950-11-13
Abstract
No abstract record available.
Inventors
- 👤 David W Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:16
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/36; B60T15/54; Y; Y10; Y10S; Y10S33/00; Y10S33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-02-18 | 1938-08-20 | 1939-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-18 | 1942-08-20 | 1943-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-18 | 1946-08-20 | 1947-02-19 | $7700.00 | Window Closed / Lapsed |