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US2135247A
Expired / Lapsed
US
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Compressor valve control
Assignee: Westinghouse Air Brake Co
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Filing: 1936-05-26
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Granted: 1938-11-01
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Expires: 1956-05-26
Abstract
No abstract record available.
Inventors
- 👤 Burton S Aikman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/10; F04B49/103; F04B27/00; F04B27/005; F04B39/00; F04B39/0094; F04B39/02; F04B39/0223; F04B39/023; F04B39/0261; F04B39/08; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/084; F04C29/00; F04C29/02; F04C29/025
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) | 1941-10-31 | 1942-05-02 | 1942-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-31 | 1946-05-02 | 1946-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-31 | 1950-05-02 | 1950-11-01 | $7700.00 | Window Closed / Lapsed |