Patent US1082667A successfully refreshed from Google Patents.
Patent US2686093A successfully refreshed from Google Patents.
US2686093A
Expired / Lapsed
US
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Piston ring
Assignee: Perfect Circle Corp
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Filing: 1951-03-30
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Granted: 1954-08-10
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 John F Shirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:29
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/203; F16J9/206; Y; Y10; Y10S; Y10S277/00; Y10S277/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |