Patent US4075524A successfully refreshed from Google Patents.
US4075524A
Expired / Lapsed
US
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Brush shunt connection
Assignee: Airco Inc
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Filing: 1976-07-01
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Granted: 1978-02-21
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Expires: 1996-07-01
Abstract
Abstract Improved shunt connections for high current conducting carbon brushes for electrical rotating machinery utilize a tamping composition comprising finely divided granules composed of 85 to 97% by weight of graphite; and 15 to 3% by weight of a high temperature-stable resin such as polyaryl sulfone. After forming the tamped connection, a sealant is applied to the tamping composition. The sealant preferably comprises an aminofunctional silane, which improves the bond between the copper shunt and the tamping composition.
Inventors
- 👤 Elmo F. Bradshaw
- 👤 John F. Rakszawski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:02
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A tamping material for securing electrical connections to carbon blocks comprising free-flowing granules each consisting essentially of 85% to 97% by weight graphite particles and 15% to 3% by weight of polyaryl sulfone resin as a binder.
Claim 2
Dependent Claim
37 words
A tamping material for securing electrical connections to carbon blocks comprising free-flowing granules each consisting essentially of 85% to 97% by weight graphite particles and 15% to 3% by weight of polyaryl sulfone resin as a binder.
Claim 3
Dependent Claim
22 words
A tamping material according to claim 1 wherein the size of said granules is in the range -20 mesh to +115 mesh.
Claim 4
Dependent Claim
22 words
A tamping material according to claim 1 wherein the size of said granules is in the range -20 mesh to +115 mesh.
Claim 5
Dependent Claim
71 words
In combination, a carbon block having a cavity formed therein, an electrical conductor having an end portion disposed in said cavity, and a body of conductive granules tamped between said portion of the conductor and the cavity wall and sealed with a polymerized sealant, said conductive granules consisting essentially of 85% to 97% by weight of graphite particles and 15% to 3% by weight of polyaryl sulfone resin as a binder.
Claim 6
Dependent Claim
71 words
In combination, a carbon block having a cavity formed therein, an electrical conductor having an end portion disposed in said cavity, and a body of conductive granules tamped between said portion of the conductor and the cavity wall and sealed with a polymerized sealant, said conductive granules consisting essentially of 85% to 97% by weight of graphite particles and 15% to 3% by weight of polyaryl sulfone resin as a binder.
Claim 7
Dependent Claim
23 words
A combination according to claim 4 in which the conductive granules tamped between the conductor and the cavity wall are sealed with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |