Patent US2456272A successfully refreshed from Google Patents.
US2456272A
Expired / Lapsed
US
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Engine cylinder construction
Assignee: Fairchild Engine and Airplane Corp
•
Filing: 1946-08-02
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Granted: 1948-12-14
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Expires: 1966-08-02
Abstract
No abstract record available.
Inventors
- 👤 Alfred T Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:14
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/26; F02F1/28; F02F1/30; F02F1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1741678A
Cited
US2227933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |