US2769675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring oil sealing structure
Assignee: Muskegon Piston Ring Co
•
Filing: 1954-11-26
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Granted: 1956-11-06
•
Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Douglas W Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:30
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/067; F16J9/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US345767A
Cited
US1720583A
Cited
US1966782A
Cited
US1811012A
Cited
US2323815A
Cited
US2468980A
Cited
US2695825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |