US3770286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: Dana Inc
•
Filing: 1971-03-11
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Granted: 1973-11-06
•
Expires: 1991-03-11
Abstract
Abstract Disclosed herein is a piston ring having an improved bearing surface and method of making the same wherein a first layer of hard chromium is electrodeposited on the bearing surface of a piston ring blank, a second layer of microcracked chromium is deposited on the first layer and the second layer of microcracked chromium is etched to provide a finely porous, friable surface, to eliminate the need for lapping of the ring and to promote break-in.
Inventors
- 👤 A Angilella
- 👤 W Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D5/00; C25D5/10; C25D5/12; C25D5/14; C25D5/60; C25D5/605; C25D5/615; C25D5/617; C25D5/625
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The sealing ring of claim 1, wherein said first layer comprises electrodeposited hard chromium plate.
Claim 2
Dependent Claim
21 words
The sealing ring of claim 1, wherein said second layer comprises electrodeposited microcracked chromium plate having an electrochemically etched ouTer surface.
Claim 3
Dependent Claim
57 words
A piston ring comprising a split metallic ring, a first layer on the circumference of said ring, said first layer comprising hard chromium plate, and a second layer on said first layer, said second layer comprising microcracked chromium plate having an etched outer surface and each of said layers having a Vicker''s hardness in excess of 775.
Claim 4
Dependent Claim
33 words
The piston ring of claim 4, where said first layer has a radial thickness of 0.0025 inch to 0.0060 inch and said second layer has a radial thickness of 0.0002 to 0.0010 inch.
Claim 5
Dependent Claim
59 words
A piston ring comprising a split metallic ring having a tool formed outer periphery, a first layer of hard chromium electrodeposited on said outer periphery, and a second layer of microcracked chromium electrodeposited on said first layer, said second layer having an electrochemically etched outer surface and each of said layers having a Vicker''s hardness in excess of 775.
Claim 6
Dependent Claim
19 words
The piston ring of claim 6, wherein said first layer has a radial thickness in excess of 0.0025 inch.
Claim 7
Dependent Claim
20 words
The piston ring of claim 6, wherein said second layer has a radial thickness not in excess of 0.001 inch.
References Cited (Backward Citations)
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Cited
GB632986A
Cited
US2589107A
Cited
US2873154A
Cited
GB844718A
Cited
US3418220A
Cited
US3573874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |