Patent US3715790A successfully refreshed from Google Patents.
US3715790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reinforcing piston ring grooves
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1971-01-13
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Granted: 1973-02-13
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Expires: 1991-01-13
Abstract
Abstract Method of making an aluminum alloy piston with a ring groove reinforcement wherein a grooved piston blank is cleaned to remove any oxide films, and a bonding metal is sprayed over the surface of the groove while the blank is at a temperature of from about 330* to 390* F., and thereafter a wear resistant metal is sprayed into the groove while the blank is still at a temperature within the aforementioned range to thereby fill the groove.
Inventors
- 👤 W Reinberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:39
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22; B; B23; B23K; B23K35/00; B23K35/001; B23K35/002; B23P; B23P15/00; B23P15/10; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2201/046; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49263; Y10T29/49265; Y10T29/49718; Y10T29/49746
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
The method of making an aluminum alloy piston with a ring groove reinforcement which comprises providing a piston blank having a peripheral groove formed therein, heating said blank to a temperature in the range from 330* to 390* F., spraying a bonding metal over the surface of said groove while the temperature of the blank is in said range, and thereafter spraying a wear resistant metal into said groove to fill the same while said blank is at a temperature within said range.
Claim 2
Independent Claim
83 words
The method of making an aluminum alloy piston with a ring groove reinforcement which comprises providing a piston blank having a peripheral groove formed therein, heating said blank to a temperature in the range from 330* to 390* F., spraying a bonding metal over the surface of said groove while the temperature of the blank is in said range, and thereafter spraying a wear resistant metal into said groove to fill the same while said blank is at a temperature within said range.
Claim 3
Dependent Claim
14 words
The method of claim 1 in which said wear resistant metal is stainless steel.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which said wear resistant metal is nickel aluminide.
Claim 5
Dependent Claim
47 words
The method of claim 1 which includes the steps of heating said blank to an elevated temperature between 400* F. and the softening point of the blank, and grit blasting said groove while said blank is at said elevated temperature prior to spraying on said bonding metal.
Claim 6
Dependent Claim
13 words
The method of claim 1 in which said groove has a stepped profile.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |