Patent US7767113B2 successfully refreshed from Google Patents.
US7767113B2
Expired / Lapsed
US
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Method of manufacturing metal-graphite brush material for motor
Assignee: Aisin Corp
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Filing: 2006-02-24
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Granted: 2010-08-03
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Expires: 2026-02-24
Abstract
Abstract A method of manufacturing a metal-graphite brush material for a motor, which allows high-density formation of copper particles on the surfaces of graphite particles. The method: attaches copper complex to graphite particles; heat-treats the graphite particles attached with the copper particles, thereby to pyrolyze the copper complex to form copper particles on the surfaces of the graphite particles; forms the graphite particles having the copper particles formed thereon, together with a resin, into a formed product; and reduction-sinters the formed product under a reducing atmosphere to pyrolyze the resin, thereby to form a sintered body and also to reduce copper oxide formed in surface layers of the copper particles during the heat-treating.
Inventors
- 👤 Hiroshi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:48
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/12; B; B22; B22F; B22F1/00; B22F1/18; B22F2998/00; B22F2998/10; H01R39/00; H01R39/02; H01R39/18; H01R39/20; H01R39/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A method of manufacturing a metal-graphite brush material for motor, the method comprising the steps of: attaching copper complex to graphite particles; heat-treating the graphite particles attached with the copper particles, thereby to pyrolyze the copper complex to form copper particles on the surfaces of the graphite particles; forming the graphite particles having the copper particles formed thereon, together with a resin, into a formed product; and reduction-sintering said formed product under a reducing atmosphere to pyrolyze said resin, thereby to form a sintered body and also to reduce copper oxide formed in surface layers of the copper particles during said heat-treating step.
Claim 2
Independent Claim
103 words
A method of manufacturing a metal-graphite brush material for motor, the method comprising the steps of: attaching copper complex to graphite particles; heat-treating the graphite particles attached with the copper particles, thereby to pyrolyze the copper complex to form copper particles on the surfaces of the graphite particles; forming the graphite particles having the copper particles formed thereon, together with a resin, into a formed product; and reduction-sintering said formed product under a reducing atmosphere to pyrolyze said resin, thereby to form a sintered body and also to reduce copper oxide formed in surface layers of the copper particles during said heat-treating step.
Claim 3
Dependent Claim
36 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 1 , wherein said reduction-sintering step employs a sintering temperature which is set lower than a heat-treating temperature employed in said heat-treating step.
Claim 4
Dependent Claim
43 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 1 , wherein a sintering temperature employed in the reduction-sintering step and a heat-treating temperature employed in the heat-treating step are both set to range from 300 to 350° C.
Claim 5
Dependent Claim
33 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 1 , wherein said reduction-sintering step employs a sintering temperature which is higher than a pyrolysis-starting temperature of the resin.
Claim 6
Dependent Claim
39 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 1 , wherein said resin is prepared in the form of a solution containing from 1 to 3 wt.% of solids of the resin dissolved therein.
Claim 7
Dependent Claim
38 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 1 , wherein said resin is at least one kind of resin selected from the group consisting of a phenol resin and a fran resin.
Claim 8
Dependent Claim
26 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 6 , wherein said phenol resin comprises a resol-type melamine modified phenol resin.
Claim 9
Dependent Claim
44 words
The method of manufacturing a metal-graphite brush material for motor, according to claim 7 , wherein said reduction-sintering step employs a sintering period which is set to 200 minutes or more, in the case of a sintering temperature ranging from 300 to 350° C.
References Cited (Backward Citations)
JP2001298913A
Cited
JP2003313076A
Cited
JP2004164926A
Cited
US20040255720A1
Cited
JP2005012957A
Cited
US20090060772A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2013-08-02 | 2014-02-01 | 2014-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2017-08-02 | 2018-02-01 | 2018-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2021-08-02 | 2022-02-01 | 2022-08-03 | $7700.00 | Window Closed / Lapsed |