US2854301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring expander and method of forming same
Assignee: Wilkening Manufacturing Co
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Filing: 1957-09-06
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Granted: 1958-09-30
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Expires: 1977-09-06
Abstract
No abstract record available.
Inventors
- 👤 John O Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:15
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F16J9/145; F16J9/06; F16J9/061; F16J9/063; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |