US2739255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High altitude brushes
Assignee: Stackpole Carbon Co
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Filing: 1954-11-16
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Granted: 1956-03-20
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Expires: 1974-11-16
Abstract
No abstract record available.
Inventors
- 👤 Ii Erle I Shobert
- 👤 Walter G Krellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:39
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A HIGH-ALTITUDE BRUSH HAVING A CONTACT SURFACE AT ONE END ADAPTED TO ENGAGE A ROTATING CURRENT-COLECTING RING, THE BRUSH COMPRISING A CARBON BODY, AND A NARROW STRIP OF AN ADJUVANT EXTENDING ACROSS SAID SURFACE AND FORMING A PART OF IT, SAID ADJUVANT COMPRISING A MIXTURE OF RESIN AND GRAPHITE AND A COMPOUND THAT INCREASES THE LIFE OF CARBON BRUSHES AT HIGH ALTITUDES, THE AMOUNT OF SAID GRAPHITE BEING SUBSTANTIALLY THE MINIMUM AMOUNT REQUIRED FOR AVOIDING SPALLING.
Claim 2
Dependent Claim
76 words
A HIGH-ALTITUDE BRUSH HAVING A CONTACT SURFACE AT ONE END ADAPTED TO ENGAGE A ROTATING CURRENT-COLECTING RING, THE BRUSH COMPRISING A CARBON BODY, AND A NARROW STRIP OF AN ADJUVANT EXTENDING ACROSS SAID SURFACE AND FORMING A PART OF IT, SAID ADJUVANT COMPRISING A MIXTURE OF RESIN AND GRAPHITE AND A COMPOUND THAT INCREASES THE LIFE OF CARBON BRUSHES AT HIGH ALTITUDES, THE AMOUNT OF SAID GRAPHITE BEING SUBSTANTIALLY THE MINIMUM AMOUNT REQUIRED FOR AVOIDING SPALLING.
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) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |