Patent US2801523A successfully refreshed from Google Patents.
Patent US2944856A successfully refreshed from Google Patents.
US2944856A
Expired / Lapsed
US
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Safety valve for automotive air brake systems
Assignee: RAILWAY APPLIANCE RES Ltd
•
Filing: 1956-01-26
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Granted: 1960-07-12
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Robert E Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:23
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/403; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2663; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |