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Patent US2817564A successfully refreshed from Google Patents.
US2817564A
Expired / Lapsed
US
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Piston ring
Assignee: Ramsey Corp
•
Filing: 1953-12-04
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Granted: 1957-12-24
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Expires: 1973-12-04
Abstract
No abstract record available.
Inventors
- 👤 Melvin W Marien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:02
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/12; F16J9/14; F16J9/145; Y; Y10; Y10S; Y10S292/00; Y10S292/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US345767A
Cited
US1580092A
Cited
US1850674A
Cited
US2293450A
Cited
US2635022A
Cited
US2695825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |