Patent US2855659A successfully refreshed from Google Patents.
US2855659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered powdered metal piston ring
Assignee: Motors Liquidation Co
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Filing: 1954-12-29
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Granted: 1958-10-14
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Robert F Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:27
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A POROUS PISTON RING FOR AN INTERNAL COMBUSTION ENGINE, SAID PISTON RING BEING CHARACTERIZED BY HIGH WEAR RESISTANCE AND BEING FORMED OF A SINTERED AND WORKED POWDERED METAL MIX COMPRISING APPROXIMATELY 0.3% TO 3% CARBON, 1.5% TO 6% OF CRYSTALLINE AL2O3, AND THE BALANCE SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
47 words
A POROUS PISTON RING FOR AN INTERNAL COMBUSTION ENGINE, SAID PISTON RING BEING CHARACTERIZED BY HIGH WEAR RESISTANCE AND BEING FORMED OF A SINTERED AND WORKED POWDERED METAL MIX COMPRISING APPROXIMATELY 0.3% TO 3% CARBON, 1.5% TO 6% OF CRYSTALLINE AL2O3, AND THE BALANCE SUBSTANTIALLY ALL IRON.
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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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |