Patent US2853974A successfully refreshed from Google Patents.
US2853974A
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Piston cushioning arrangement for cylinders
Assignee: Westinghouse Air Brake Co
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Filing: 1955-10-31
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Granted: 1958-09-30
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Ellis E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:10
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B15/223; F16; F16F; F16F9/00; F16F9/32; F16F9/48; F16F9/49
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |