US2807511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated piston ring
Assignee: Motors Liquidation Co
•
Filing: 1953-05-11
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Granted: 1957-09-24
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Expires: 1973-05-11
Abstract
No abstract record available.
Inventors
- 👤 James D Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:07
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49281; Y10T428/00; Y10T428/21; Y10T428/218; Y10T428/219; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN AN INTERNAL COMBUSTION ENGINE, A PISTON RING FOR OPERATION IN A MAIN CYLINDER THEREOF, SAID PISTON RING COMPRISING A RESILIENT FERROUS BASE METAL MEMBER SHAPED IN THE FORM OF AN ANNULAR SPLIT PISTON RING HAVING A SMOOTH, NON-POROUS, OUTER SURFACE PROVIDED WITH A CONTINOUS, NON-POROUS COATING OF SINTERED POLYTETRAFLUOROETHYLENE, SAID COATING HAVING A THICKNESS BETWEEN APPROXIMATELY 0.001 INCH AND 0.005 INCH.
Claim 2
Dependent Claim
62 words
IN AN INTERNAL COMBUSTION ENGINE, A PISTON RING FOR OPERATION IN A MAIN CYLINDER THEREOF, SAID PISTON RING COMPRISING A RESILIENT FERROUS BASE METAL MEMBER SHAPED IN THE FORM OF AN ANNULAR SPLIT PISTON RING HAVING A SMOOTH, NON-POROUS, OUTER SURFACE PROVIDED WITH A CONTINOUS, NON-POROUS COATING OF SINTERED POLYTETRAFLUOROETHYLENE, SAID COATING HAVING A THICKNESS BETWEEN APPROXIMATELY 0.001 INCH AND 0.005 INCH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |