Patent US2564744A successfully refreshed from Google Patents.
US2564744A
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Piston-ring expander
Assignee: Wilkening Manufacturing Co
•
Filing: 1946-05-03
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Granted: 1951-08-21
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Expires: 1966-05-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Wilkening
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:31
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F16J9/145; F16J9/06; F16J9/061; F16J9/063; F16J9/064; F16J9/066; F16J9/068; Y; Y10; Y10T; Y10T83/00; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9428; Y10T83/943
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US345767A
Cited
US1966782A
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US1933568A
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US2085457A
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US2293450A
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US2346898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |