US2550879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimetallic piston
Assignee: Fairchild Engine and Airplane Corp
•
Filing: 1949-11-10
•
Granted: 1951-05-01
•
Expires: 1969-11-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles E Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:54
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0696; F02F; F02F3/00; F02F3/02; F02F3/04; F02F3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1807689A
Cited
FR566312A
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US1979335A
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US1946081A
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US2123181A
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US2255006A
Cited
US2265243A
Cited
US2278958A
Cited
US2285811A
Cited
US2328788A
Cited
GB581527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |