Patent US493767A successfully refreshed from Google Patents.
Patent US148744A successfully refreshed from Google Patents.
Patent US4735657A successfully refreshed from Google Patents.
Patent US2898341A successfully refreshed from Google Patents.
Patent US2155257A successfully refreshed from Google Patents.
US2155257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid compressor
Assignee: Westinghouse Air Brake Co
•
Filing: 1937-03-13
•
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
2026-11-09 01:33
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |