US2989490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact brush for high altitude use
Assignee: Union Carbide Corp
•
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 01:11
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.
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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) | 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 |