US2811762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding piston rings
Assignee: SKF Automotive Products Inc
•
Filing: 1952-10-18
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Granted: 1957-11-05
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Expires: 1972-10-18
Abstract
No abstract record available.
Inventors
- 👤 George C Mayfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:19
CPC Classifications
B; B22; B22D; B22D15/00; B22D15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR956146A
Cited
US2101046A
Cited
US2401075A
Cited
GB619991A
Cited
US2509154A
Cited
US2594998A
Cited
US2621381A
Cited
US2621382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |