Patent US2957376A successfully refreshed from Google Patents.
Patent US4612260A successfully refreshed from Google Patents.
US4612260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring member
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1984-08-09
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Granted: 1986-09-16
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Expires: 2004-08-09
Abstract
Abstract A piston ring having an improved wear resistance and antiseizure properties and good workability is disclosed. The piston ring is made of a martensite stainless steel comprising from 0.4 to 0.7 wt % C, 0.3 to 1.0 wt % Si, 0.5 to 1.0 wt % Mn, and 2.0 to 9.0 wt % Cr, the balance being iron and impurities. Additionally, a surface-treated layer having a quench and temper hardness (H R C) of 40 to 50 is formed on at least that part of the piston ring which slides against the wall of a cylinder in which reciprocates a piston on which the piston ring is mounted. Preferably, the surface-treated layer is formed by hard Cr plating.
Inventors
- 👤 Atsushi Kumagai
- 👤 Tsutomu Tanabe
- 👤 Hirokazu Yasunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:24
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; C; C22; C22C; C22C37/00; C22C37/10; C22C38/00; C22C38/18; C21; C21D; C21D2211/00; C21D2211/008; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/937; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A piston ring member having improved wear resistance and scuffing resistance, said piston ring member being made of a martensite stainless steel consisting of from 0.4 to 0.7 wt % C, 0.3 to 1.0 wt % Si, 0.5 to 1.0 wt % Mn, and 2.0 to 9.0 wt % Cr, the balance being iron and impurities, and a surface-treated layer having a quench and temper hardness (H R C) of 40 to 50 being formed on at least that part of said piston ring member which slides against a wall of a cylinder in which reciprocates a piston on which said piston ring member is mounted.
Claim 2
Dependent Claim
106 words
A piston ring member having improved wear resistance and scuffing resistance, said piston ring member being made of a martensite stainless steel consisting of from 0.4 to 0.7 wt % C, 0.3 to 1.0 wt % Si, 0.5 to 1.0 wt % Mn, and 2.0 to 9.0 wt % Cr, the balance being iron and impurities, and a surface-treated layer having a quench and temper hardness (H R C) of 40 to 50 being formed on at least that part of said piston ring member which slides against a wall of a cylinder in which reciprocates a piston on which said piston ring member is mounted.
Claim 3
Dependent Claim
18 words
The piston ring member according to claim 1, wherein said surface-treated layer is a hard Cr plated layer.
Claim 4
Dependent Claim
18 words
The piston ring member according to claim 1, wherein said surface-treated layer is a porous Cr plated layer.
Claim 5
Dependent Claim
17 words
The piston ring member according to claim 1, wherein said surface-treated layer is a compound plated layer.
Claim 6
Dependent Claim
17 words
The piston ring member according to claim 1, wherein said surface-treated layer is a sprayed Cr layer.
Claim 7
Dependent Claim
17 words
The piston ring member according to claim 1, wherein said surface-treated layer is a sprayed Mo layer.
Claim 8
Dependent Claim
22 words
The piston ring member according to claim 2, wherein said surface-treated layer has a hardness (H V ) of at least 850.
Claim 9
Dependent Claim
36 words
The piston ring member according to claim 2, wherein said piston ring member is provided with upper and lower side surfaces, and wherein said surface-treated layer is additionally provided on said upper and lower side surfaces.
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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |