US2844544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for copper graphite brush
Assignee: Union Carbide Corp
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Filing: 1955-03-08
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Granted: 1958-07-22
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Expires: 1975-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ramadanoff Dimiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:49
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20; H01R39/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
AN ELECTRICAL CONTACT BRUSH CONSISTING OF ABOUT 30% TO 75% COPPER, 25% TO 70% GRAPHITE,2.1% TO 5% BORON NITRIDE AND 1% TO 10% LEAD, SAID BORON NITRIDE AND LEAD RENDERING SAID BRUSH SUBSTANTIALLY RESISTANT TO DUSTING CONDITIONS AND IMPARTING LONGER WEAR LIFE THERETO.
Claim 2
Dependent Claim
43 words
AN ELECTRICAL CONTACT BRUSH CONSISTING OF ABOUT 30% TO 75% COPPER, 25% TO 70% GRAPHITE,2.1% TO 5% BORON NITRIDE AND 1% TO 10% LEAD, SAID BORON NITRIDE AND LEAD RENDERING SAID BRUSH SUBSTANTIALLY RESISTANT TO DUSTING CONDITIONS AND IMPARTING LONGER WEAR LIFE THERETO.
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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |