US4876158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring having a wear resistant surface layer
Assignee: Riken Corp
•
Filing: 1988-03-18
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Granted: 1989-10-24
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Expires: 2008-03-18
Abstract
Abstract There is disclosed a wear resistant surface layer composed of 40 to 70 wt. % cobalt or cobalt base alloy as binder and the balance is substantially chromium oxide particles.
Inventors
- 👤 Toru Onuki
- 👤 Junichi Sagawa
- 👤 Tamotsu Watanabe
- 👤 Toshio Yoshimitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:13
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C22; C22C; C22C29/00; C22C29/12; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; C23C4/02; F; F16; F16J; F16J9/00; F16J9/26; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T428/12146; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12611
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
A piston ring having a wear resistant surface layer consisting essentially of 40 to 70 wt. % cobalt or cobalt base alloy as a binder, and the balance being substantially a powder of dichromium trioxide (Cr 2 O 3 ).
Claim 2
Dependent Claim
40 words
A piston ring having a wear resistant surface layer consisting essentially of 40 to 70 wt. % cobalt or cobalt base alloy as a binder, and the balance being substantially a powder of dichromium trioxide (Cr 2 O 3 ).
Claim 3
Dependent Claim
27 words
A piston ring as claimed in claim 1 wherein an undercoating layer of nickel-chromium alloy is located between a base material and the wear resistant surface layer.
References Cited (Backward Citations)
EP0184604A1
Cited
US4681817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |