Patent US2989490A successfully refreshed from Google Patents.
US2989490A
Expired / Lapsed
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Electrical contact brush for high altitude use
Assignee: Union Carbide Corp
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Filing: 1958-02-19
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Granted: 1961-06-20
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Expires: 1978-02-19
Abstract
No abstract record available.
Inventors
- 👤 Ramadanoff Dimiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:19
CPC Classifications
H; H01; H01B; H01B1/00; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
AN ELECTRICAL CONTACT BRUSH ADAPTED TO OPERATE EFFICIENTLY AT ALTITUDES OF AT LEAST 40,000 FEET CONSISTING OF 25% TO 75% COPPER, 10% TO 60% GRAPHITE, 0.1% TO 5% BORON NITRIDE, 5% TO 25% IN THE AGGREGATE OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF BARIUM FLUORIDE, STRONTIUM CARBONATE AND CALCIUM CARBONATE, UP TO 5% COUMARONE INDENE RESIN AND UP TO 10% IN THE AGGREGATE OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF LEAD, SILVER AND TIN.
Claim 2
Dependent Claim
82 words
AN ELECTRICAL CONTACT BRUSH ADAPTED TO OPERATE EFFICIENTLY AT ALTITUDES OF AT LEAST 40,000 FEET CONSISTING OF 25% TO 75% COPPER, 10% TO 60% GRAPHITE, 0.1% TO 5% BORON NITRIDE, 5% TO 25% IN THE AGGREGATE OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF BARIUM FLUORIDE, STRONTIUM CARBONATE AND CALCIUM CARBONATE, UP TO 5% COUMARONE INDENE RESIN AND UP TO 10% IN THE AGGREGATE OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF LEAD, SILVER AND TIN.
References Cited (Backward Citations)
US1121960A
Cited
US1299846A
Cited
US2156803A
Cited
US2445003A
Cited
US2640944A
Cited
GB712188A
Cited
US2731371A
Cited
US2739254A
Cited
US2844544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |