US5175463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon commutator
Assignee: Kirkwood Industries Inc
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Filing: 1991-12-13
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Granted: 1992-12-29
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Expires: 2011-12-13
Abstract
Abstract A fuel pump and the method for making the fuel pump designed for operation in an environment of a hydrocarbon fuel having a significant portion of oxygen-containing moieties are disclosed. The pump consists of a body, a shaft, a commutator, and brushes in contact with the commutator; the method of making the commutator comprises the steps of affixing a formed carbon article to a suitable substrate, machining the article to a commutator, and cutting slots into the commutator. In one embodiment, the method includes forming the carbon article directly on the substrate prior to the machining steps.
Inventors
- 👤 Charles P. Farago
- 👤 D. Bruce Ramsey, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:30
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R39/00; H01R39/02; H01R39/04; H01R39/045; H01R39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A commutator comprising: a planar substrate including a series of current-carrying regions, a corresponding series of commutator segments, and a conductive bonding layer bonding each of said commutator segments to said substrate; each of said commutator segments comprising: a carbon base having a brush-contacting first surface and a second opposite surface which is substantially parallel to said first surface; and a conductive plating positioned between said second surface of said carbon base and said bonding layer.
Claim 2
Dependent Claim
76 words
A commutator comprising: a planar substrate including a series of current-carrying regions, a corresponding series of commutator segments, and a conductive bonding layer bonding each of said commutator segments to said substrate; each of said commutator segments comprising: a carbon base having a brush-contacting first surface and a second opposite surface which is substantially parallel to said first surface; and a conductive plating positioned between said second surface of said carbon base and said bonding layer.
Claim 3
Dependent Claim
49 words
A commutator as set forth in claim 1 wherein said conductive plating comprises a first conductive layer substantially covering said second surface of said carbon base and a second conductive layer substantially covering said first conductive layer and being positioned between said bonding layer and said first conductive layer.
Claim 4
Dependent Claim
32 words
A commutator as set forth in claim 2 wherein said first conductive layer is comprised of a material selected from a group consisting of nickel, copper, gold, silver, or conductive alloys thereof.
Claim 5
Dependent Claim
24 words
A commutator as set forth in claim 3 wherein said second conductive layer is made of the same material as said first conductive layer.
Claim 6
Dependent Claim
24 words
A commutator as set forth in claim 3 wherein said second conductive layer is made of a different material than said first conductive layer.
Claim 7
Dependent Claim
31 words
A commutator as set forth in claim 2 wherein said second conductive layer is made of a material selected from a group consisting of copper, gold, silver, copper or conductive alloy.
Claim 8
Dependent Claim
27 words
A commutator as set forth in claim 2 wherein said first conductive layer is made of nickel and wherein said second conductive layer is made of copper.
Claim 9
Dependent Claim
27 words
A commutator as set forth in claim 2 wherein said current-carrying members each comprise a conductive substrate plate portion positioned adjacent to said second conductive bonding layer.
Claim 10
Dependent Claim
18 words
A commutator as set forth in claim 1 wherein said conductive bonding layer comprises a heat-forming bonding material.
Claim 11
Dependent Claim
23 words
A commutator as set forth in claim 9 wherein said heat-forming bonding material is a low temperature melting solder containing tin and antimony.
Claim 12
Dependent Claim
18 words
A commutator as set forth in claim 1 wherein said conductive bonding layers comprises an electrically conductive adhesive.
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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |