Patent US2739912A successfully refreshed from Google Patents.
US2739912A
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Dynamoelectric brush and method of making same
Assignee: Stackpole Carbon Co
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Filing: 1954-11-09
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Granted: 1956-03-27
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Expires: 1974-11-09
Abstract
No abstract record available.
Inventors
- 👤 Smisko Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:42
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20; H01B; H01B1/00; H01B1/04; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
THAT METHOD OF MAKING A DYNAMOELECTRIC BRUSH FROM A POROUS BODY OF ELECTRICALLY CONDUCTIVE CARBONACEOUS MATERIAL COMPRISING THE STEPS OF IMPREGNATING SAID BODY WITH A COMPOUND OF THE GROUP CONSISTING OF LITHIUM HYDROXIDE AND LITHIUM ACETATE, AND HEATING THE IMPREGNATED BODY AT A TEMPERATURE AND FOR A TIME TO CONVERT THE LITHIUM COMPOUND THUS INCORPORATED IN THE BODY TO LITHIUM CARBONATE.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |