US3661402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1970-08-10
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Granted: 1972-05-09
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Expires: 1990-08-10
Abstract
Abstract A piston ring with a highly wear-resistant sliding surface of tungsten-cobalt electrodeposit and a sliding ring of a sintered mixture of iron oxide and carbon powder.
Inventors
- 👤 Kouichi Iizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:30
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/08; F; F16; F16J; F16J9/00; F16J9/26; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49281
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A piston ring as set forth in claim 1, wherein said coating has a thickness of about 0.08 mm to 0.01 mm.
Claim 2
Dependent Claim
22 words
A piston ring as set forth in claim 1, wherein said sliding ring essentially consists of iron oxide powder and carbon powder.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |