Patent CH247199A successfully refreshed from Google Patents.
US2631908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: Perfect Circle Corp
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Filing: 1947-10-29
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Granted: 1953-03-17
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Expires: 1967-10-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Teetor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:38
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/203; F16J9/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB523275A
Cited
US2397636A
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US2317580A
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US2290499A
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US2239376A
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US2273691A
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US2346896A
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US2452503A
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US2404862A
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US2460431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |