US2155257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid compressor
Assignee: Westinghouse Air Brake Co
•
Filing: 1937-03-13
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Granted: 1939-04-18
•
Expires: 1957-03-13
Abstract
No abstract record available.
Inventors
- 👤 Philip L Crittenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:23
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/12; F04B39/128; F04B49/00; F04B49/22; F04B49/24; F04B49/243; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7559; Y10T137/8593; Y10T137/87265
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) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |