Piston ring
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Nov 29, 2016
Grant Date -
Aug 13, 2015
app pub date -
Apr 23, 2015
filing date -
Feb 28, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The second compression ring is formed such that the outer peripheral surface shape has a tapered face, and the radial cross-sectional shape is a rectangular ring, a scraper ring, or a Napier ring, and has a piston ring base and a hard film provided at least on an outer peripheral sliding surface thereof. The piston ring base is composed of a low-alloy steel or carbon steel having a Vickers hardness of Hv 350 Hv 550. The outer peripheral sliding surface is formed so that the axial length is from 0.01 to 0.30 mm between the outer edge end part of the tapered outer peripheral sliding surface and an imaginary line contacting with a lower end surface where a curved surface having a diameter that decreases gradually inward from the outer edge end part toward the lower end in the axial direction is parallel to a ring underside.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | B2 | JP6062357 | Feb 27, 2012 |
| US | A1 | US20130328274 | Feb 27, 2012 |
| WO | A1 | WO2012118036 | Feb 27, 2012 |
| CN | B | CN103403409 | Feb 27, 2012 |
International Classification(s)
- 2015 Application Filing Year
- C23C Class
- 3009 Applications Filed
- 2118 Patents Issued To-Date
- 70.39 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- C23C Class
- 18.59 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 29, 2028 |
