Patent US3731941A successfully refreshed from Google Patents.
US3731941A
Expired / Lapsed
US
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Facing materials for an internal combustion engine cylinder and a cooperating piston ring
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1971-12-01
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Granted: 1973-05-08
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Expires: 1991-12-01
Abstract
Abstract Abrasion wear of piston rings and of the inner cylinder wall of an internal combustion engine is very low when the piston ring consists of cast iron of specified composition and a Rockwell hardness of at least C 40, and the cylinder wall consists of electrodeposited nickel having fine particles of silicon carbide or other very hard material dispersed therein so that the cylinder wall has a hardness of Rockwell A 70 - A 100.
Inventors
- 👤 Y Mori
- 👤 Y Sato
- 👤 K Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:02
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06; C22C37/08; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C33/121; F16J; F16J9/00; F16J9/26; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
said second face portion essentially consisting of electrolytically deposited nickel and pulverulent particles of a material much harder than said nickel dispersed in the same.
Claim 2
Dependent Claim
38 words
In an apparatus as set forth in claim 1, one of said members being a piston ring in an internal combustion engine, and the other member constitutIng the inner wall of a cylinder receiving said piston ring therein.
Claim 3
Dependent Claim
65 words
In an apparatus as set forth in claim 2, said cast iron containing 2.5 - 4.0 percent carbon, 1.5 - 3.0 percent silicon, 0.1 - 1.0 percent molybdenum, 0.1 - 1.0 percent nickel, 0.1 - 1.0 percent chromium, 0.3 - 1.5 percent manganese, incidental impurities, the balance being iron, said impurities including not substantially more than 0.1 percent phosphorus nor more than 0.1 percent sulfur.
Claim 4
Dependent Claim
26 words
In an apparatus as set forth in claim 3, said material being an oxide of aluminum or iron, a carbide of silicon or tungsten or diamond.
Claim 5
Dependent Claim
38 words
In an apparatus as set forth in claim 4, the amount of said material in said second face portion being sufficient to make the hardness of said second face portion 70 - 100 on the Rockwell A scale.
Claim 6
Dependent Claim
20 words
In an apparatus as set forth in claim 5, the size of said particles being between 10 and 100 microns.
Claim 7
Dependent Claim
27 words
In an apparatus as set forth in claim 3, said first face portion being the face portion of said piston ring, and said material being silicon carbide.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |