US2804361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring assembly
Assignee: Perfect Circle Corp
•
Filing: 1953-05-18
•
Granted: 1957-08-27
•
Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 John F Shirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; F16J9/064; F16J9/066; F16J9/069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2182851A
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US2243064A
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US2330550A
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US2362286A
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US2606800A
Cited
US2635933A
Cited
US2635022A
Cited
US2693398A
Cited
US2729524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |