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US2289251A
Expired / Lapsed
US
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Piston
Assignee: DONALDSON PISTON Corp
•
Filing: 1938-02-08
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Granted: 1942-07-07
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Expires: 1958-02-08
Abstract
No abstract record available.
Inventors
- 👤 Donaldson John Shearman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:33
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/22; F02; F02F; F02F3/00; F02F3/0015; F02F3/28; F02F3/285; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448
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) | 1945-07-06 | 1946-01-05 | 1946-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-06 | 1950-01-05 | 1950-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-06 | 1954-01-05 | 1954-07-07 | $7700.00 | Window Closed / Lapsed |