Patent US4976916A successfully refreshed from Google Patents.
US4976916A
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US
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Method for producing ferrous sintered alloy product
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1989-05-26
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Granted: 1990-12-11
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Expires: 2009-05-26
Abstract
Abstract A method for producing a ferrous sintered alloy product available for a vane used in a rotary compressor. The method comprises the steps of preparing metal powder mixture primarily containing iron, compacting the powder mixture to obtain a powder compact, sintering the powder compact to obtain a sintered body, subjecting sub-zero treatment to the sintered body, and tempering the sintered body. The sintered alloy product is used as a vane slidably disposed in a vane groove of the rotary compressor whose cooling medium is maintainable without deterioration of its property.
Inventors
- 👤 Soichi Shimomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:04
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; B; B22; B22F; B22F3/00; B22F3/12; B22F3/24; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; F04; F04C; F04C2230/00; F04C2230/20; F04C2230/22; F04C2230/40; F05; F05B; F05B2230/00; F05B2230/20; F05B2230/22; F05B2230/40; F05B2280/00; F05B2280/10; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49323
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A method for producing a ferrous sintered alloy product comprising the steps of: preparing metal powder mixture primarily comprising iron; compacting said powder mixture to obtain a powder compact; sintering said powder compact to obtain a sintered body; subjecting sub-zero treatment to said sintered body; and, tempering said sub-zero treated sintered body, whereby the resultant sintered alloy product is free from retained austenite.
Claim 2
Independent Claim
63 words
A method for producing a ferrous sintered alloy product comprising the steps of: preparing metal powder mixture primarily comprising iron; compacting said powder mixture to obtain a powder compact; sintering said powder compact to obtain a sintered body; subjecting sub-zero treatment to said sintered body; and, tempering said sub-zero treated sintered body, whereby the resultant sintered alloy product is free from retained austenite.
Claim 3
Dependent Claim
21 words
The method as defined in claim 1, wherein said sub-zero treatment is performed at a temperature not more than -80° C.
Claim 4
Dependent Claim
21 words
The method as defined in claim 1, wherein said sub-zero treatment is performed at a temperature not more than -100° C.
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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) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |