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Patent US2719767A successfully refreshed from Google Patents.
US2719767A
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Piston ring structure
Assignee: GUY H HALL
•
Filing: 1952-04-12
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Granted: 1955-10-04
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Expires: 1972-04-12
Abstract
No abstract record available.
Inventors
- 👤 Ernest Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:10
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; Y; Y10; Y10S; Y10S277/00; Y10S277/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304360A
Cited
US1738534A
Cited
US1796792A
Cited
US2356909A
Cited
US2396018A
Cited
US2653065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |