US4859164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrous sintered alloy vane and rotary compressor
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1987-11-25
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Granted: 1989-08-22
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Expires: 2007-11-25
Abstract
Abstract A vane used in a rotary compressor, and rotary compressor including the vane are made from a ferrous sintered alloy. 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 09:17
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: 7
Claim 1
Independent Claim
85 words
A vane for use in a rotary compressor employing a cooling medium, said vane comprising a ferrous sintered alloy product produced by the steps of: preparing metal powder mixture primarily containing 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; tempering said sub-zero treated sintered body; and machining said sintered body, whereby said cooling medium is maintained without deterioration of its property upon operation of said rotary compressor.
Claim 2
Dependent Claim
85 words
A vane for use in a rotary compressor employing a cooling medium, said vane comprising a ferrous sintered alloy product produced by the steps of: preparing metal powder mixture primarily containing 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; tempering said sub-zero treated sintered body; and machining said sintered body, whereby said cooling medium is maintained without deterioration of its property upon operation of said rotary compressor.
Claim 3
Dependent Claim
42 words
A vane for use in a rotary compressor as claimed in claim 1, wherein said metal powder mixture comprises 0.8-1.5% by weight of carbon, 0.5-2.0% by weight of nickel, 5.0-10.0% by weight of chromium, 0.8-2.0% by weight molybdenum and the balance iron.
Claim 4
Dependent Claim
62 words
A rotary compressor comprising: a casing; a rotor housing disposed in said casing and formed with a groove; a rotor eccentrically rotatable in said rotor housing; a vane disposed slidable relative to said groove and in sliding contact with said rotor, said vane being formed of a ferrous sintered alloy which is subjected to sub-zero treatment after sintering and prior to tempering.
Claim 5
Dependent Claim
62 words
A rotary compressor comprising: a casing; a rotor housing disposed in said casing and formed with a groove; a rotor eccentrically rotatable in said rotor housing; a vane disposed slidable relative to said groove and in sliding contact with said rotor, said vane being formed of a ferrous sintered alloy which is subjected to sub-zero treatment after sintering and prior to tempering.
Claim 6
Dependent Claim
80 words
A rotary compressor as claimed in claim 3, wherein said ferrous sintered alloy is produced by the steps of: preparing a metal powder mixture primarily containing iron; compacting said powder mixture to obtain a powder compact; sintering said powder compact to obtain a sintered body; subjecting said sintered body to sub-zero treatment; tempering said sub-zero treated sintered body; and machining said sintered body whereby a cooling medium is maintained without deterioration of its properties upon operation of said rotary compressor.
Claim 7
Dependent Claim
37 words
A rotary compressor as claimed in claim 4, wherein said metal powder mixture comprises 0.8-1.3% by weight of carbon, 0.5-2.0% by weight of nickel, 5.0-10.0% by weight of chrominum, 0.8-2.0% by weight molybdenum and the balance iron.
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |