US1870848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid compressor controlling valve
Assignee: Westinghouse Air Brake Co
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Filing: 1930-03-15
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Granted: 1932-08-09
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Expires: 1950-03-15
Abstract
No abstract record available.
Inventors
- 👤 Ellis E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:02
CPC Classifications
F; F04; F04B; F04B25/00; F04B25/005; F01; F01L; F01L25/00; F01L25/02; F01L25/04; F01L25/06; F01L25/063; F04B9/00; F04B9/08; F04B9/12; F04B9/129; F04B9/131; F04B9/133; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606; Y10T137/86622; Y10T137/8663
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) | 1935-08-09 | 1936-02-08 | 1936-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-09 | 1940-02-08 | 1940-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-09 | 1944-02-08 | 1944-08-09 | $7700.00 | Window Closed / Lapsed |