Patent US2817562A successfully refreshed from Google Patents.
US2817562A
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Coated piston
Assignee: Motors Liquidation Co
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Filing: 1953-07-01
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Granted: 1957-12-24
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Expires: 1973-07-01
Abstract
No abstract record available.
Inventors
- 👤 James D Fleming
- 👤 Hart Arnold O De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:29
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/10; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S417/00; Y10S417/01; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49263
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
IN AN INTERNAL COMBUSTION ENGINE, A METAL PISTON HAVING A HARD, DURABLE COATING OF SINTERED POLYTETRAFLUOROETHYLENE BONED TO THE OUTER SURFACES OF ITS GENERALLY CYLINDRICAL SIDE WALLS, SAID COATING HAVING A THICKNESS OF APPROXIMATELY 0.0015 INCH TO 0.0025 INCH.
Claim 2
Dependent Claim
39 words
IN AN INTERNAL COMBUSTION ENGINE, A METAL PISTON HAVING A HARD, DURABLE COATING OF SINTERED POLYTETRAFLUOROETHYLENE BONED TO THE OUTER SURFACES OF ITS GENERALLY CYLINDRICAL SIDE WALLS, SAID COATING HAVING A THICKNESS OF APPROXIMATELY 0.0015 INCH TO 0.0025 INCH.
References Cited (Backward Citations)
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 |