US3668451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical brush structure
Assignee: JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) Ltd
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Filing: 1970-08-14
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Granted: 1972-06-06
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Expires: 1990-08-14
Abstract
Abstract A current transfer brush for an electrical machine consists of refractory fibers, such as aluminum oxide fibers, with a deposited metallic film. The fibers provide mechanical strength with flexibility while the metallic films carry the current and high current densities can be achieved with low wear rates for the brushes and the contact surface which they traverse.
Inventors
- 👤 Ian Roderick Mcnab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:23
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
A current transfer brush as claimed in claim 1 in which each of said fibers has a diameter less than 10 thousandths of an inch.
Claim 2
Dependent Claim
19 words
A brush as claimed in claim 1 having means holding said fibers with their metallic films in mutual contact.
Claim 3
Dependent Claim
23 words
A brush as claimed in claim 3 in which said holding means comprises a metallic casing surrounding the fibers at one end thereof.
Claim 4
Dependent Claim
20 words
A current transfer brush as claimed in claim 1 in combination with a movable contact member having a lubricated surface.
Claim 5
Dependent Claim
30 words
A current transfer brush as claimed in claim 5 in which the surface of the contact member is composed of graphite or a metal-graphite composite material having a lubricating effect.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |