Patent US5257652A successfully refreshed from Google Patents.
Patent US4344634A successfully refreshed from Google Patents.
US4344634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression rings
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1980-12-04
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Granted: 1982-08-17
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Expires: 2000-12-04
Abstract
Abstract A compression ring composed of stainless steel comprising from 0.6 to 0.7% by weight C, from 0.15 to 0.40% by weight Si, from 0.6 to 0.8% by weight Mn, from 12.0 to 14.0% by weight Cr, and the balance of Fe and impurities, wherein a running face of the ring which slides the cylinder wall has a surface treated layer. This compression ring has excellent heat collapse resistance and excellent wear resistance on upper and lower sides.
Inventors
- 👤 Teruo Onozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:25
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
A compression ring for internal combustion engines having excellent heat collapse resistance and excellent wear resistance on upper and lower sides, said ring being composed of stainless steel comprising from 0.6 to 0.7% by weight C, from 0.15 to 0.40% by weight Si, from 0.6 to 0.8% by weight Mn, from 12.0 to 14.0% by weight Cr, and the balance of Fe and impurities, wherein a running face of the ring which slides against the cylinder wall has a surface treated layer.
Claim 2
Dependent Claim
82 words
A compression ring for internal combustion engines having excellent heat collapse resistance and excellent wear resistance on upper and lower sides, said ring being composed of stainless steel comprising from 0.6 to 0.7% by weight C, from 0.15 to 0.40% by weight Si, from 0.6 to 0.8% by weight Mn, from 12.0 to 14.0% by weight Cr, and the balance of Fe and impurities, wherein a running face of the ring which slides against the cylinder wall has a surface treated layer.
Claim 3
Dependent Claim
34 words
A compassion ring as in claim 1, wherein said running face of the ring has a surface treated layer formed by hard Cr plating, porous Cr plating, compound plating, Cr spraying, or Mo spraying.
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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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |