US2081462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1936-03-21
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Granted: 1937-05-25
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Expires: 1956-03-21
Abstract
No abstract record available.
Inventors
- 👤 Glenn T Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:58
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/06; F16K15/063; F16K2200/00; F16K2200/20; F16K2200/201; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6161; Y10T137/6164; Y10T137/6167; Y10T137/6171; Y10T137/6174; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7842; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7922; Y10T137/7929; Y10T137/7938; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18208
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) | 1940-05-24 | 1940-11-23 | 1941-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-24 | 1944-11-23 | 1945-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-24 | 1948-11-23 | 1949-05-25 | $7700.00 | Window Closed / Lapsed |