US4337407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated strand brushes
Assignee: Northrop Grumman Corp
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Filing: 1980-04-29
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Granted: 1982-06-29
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Expires: 2000-04-29
Abstract
Abstract A brush having at least a portion thereof adjacent the trailing end made up of a plurality of individually insulated strands of highly conductive material.
Inventors
- 👤 George T. Hummert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:44
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
An electrical conductive brush for a dynamoelectric machine, said brush having a plurality of segments including leading and trailing segments, said trailing segments being insulated from each other and said trailing segments comprising a plurality of individually insulated strands of highly conductive material physically and electrically connected together at one end, said segments each being electrically connected to a lead having resistance disposed therein, said resistance in the lead connected to the leading segment being substantially less than the resistance in the lead connected to the trailing segment, thereby suppressing the energy in an arc formed as the trailing segment breaks contact and preventing melting of the conductive strands.
Claim 2
Dependent Claim
109 words
An electrical conductive brush for a dynamoelectric machine, said brush having a plurality of segments including leading and trailing segments, said trailing segments being insulated from each other and said trailing segments comprising a plurality of individually insulated strands of highly conductive material physically and electrically connected together at one end, said segments each being electrically connected to a lead having resistance disposed therein, said resistance in the lead connected to the leading segment being substantially less than the resistance in the lead connected to the trailing segment, thereby suppressing the energy in an arc formed as the trailing segment breaks contact and preventing melting of the conductive strands.
Claim 3
Dependent Claim
33 words
A brush as set forth in claim 1, wherein the resistance in the leads connected to the trailing segments are graduated and decrease in value as the distance from the trailing segment increases.
Claim 4
Dependent Claim
16 words
A brush as set forth in claim 1, wherein some of the brush segments are monolithic.
Claim 5
Dependent Claim
23 words
A brush as set forth in claim 1, wherein some of the brush segments are silver and graphite formed into a monolithic shape.
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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |