Patent US2428491A successfully refreshed from Google Patents.
US2428491A
Expired / Lapsed
US
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Piston oil ring
Assignee: Individual
•
Filing: 1945-07-16
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Granted: 1947-10-07
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Expires: 1965-07-16
Abstract
No abstract record available.
Inventors
- 👤 Gerald M M Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:09
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/206; F16J9/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1749831A
Cited
US1803309A
Cited
US1868744A
Cited
US2101120A
Cited
GB439353A
Cited
US2169613A
Cited
US2128372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |