US2512362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating carbon brushes
Assignee: Westinghouse Electric Corp
•
Filing: 1946-02-25
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Granted: 1950-06-20
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Expires: 1966-02-25
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Moberly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:24
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN THE PROCESS OF TREATING CARBON BRUSHES, THE STEPS OF IMPREGNATING THE CARBON BRUSH WITH SUBSTANTIAL AMOUNTS OF A CONCENTRATED SOLUTION OF METAL SALT SELECTED FROM THE GROUP CONSISTING OF LEAD NITRATE AND LEAD ACETATE, HEATING THE CARBON BRUSH AND CONTAINED SOLUTION TO A TEMPERATURE OF THE ORDER OF 500*C. FOR A PERIOD OF TIME SUFFICIENT TO DECOMPOSE SUBSTANTIALLY COMPLETELY THE METAL SALT AND THEREBY DEPOSIT SOLID LEAD OXIDE WITHIN THE PORES OF THE CARBON BRUSH AND DRIVE OFF VOLATILE COMPONENTS, AND SUBJECTING THE BRUSH AND THELEAD OXIDE CONTAINED THEREIN TO A HALOGEN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID ANY HYDROIODIC ACID FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY COMPLETELY CHANGE THE DEPOSITED LEAD OXIDE TO A HALOGENATED LEAD COMPOUND.
Claim 2
Dependent Claim
124 words
IN THE PROCESS OF TREATING CARBON BRUSHES, THE STEPS OF IMPREGNATING THE CARBON BRUSH WITH SUBSTANTIAL AMOUNTS OF A CONCENTRATED SOLUTION OF METAL SALT SELECTED FROM THE GROUP CONSISTING OF LEAD NITRATE AND LEAD ACETATE, HEATING THE CARBON BRUSH AND CONTAINED SOLUTION TO A TEMPERATURE OF THE ORDER OF 500*C. FOR A PERIOD OF TIME SUFFICIENT TO DECOMPOSE SUBSTANTIALLY COMPLETELY THE METAL SALT AND THEREBY DEPOSIT SOLID LEAD OXIDE WITHIN THE PORES OF THE CARBON BRUSH AND DRIVE OFF VOLATILE COMPONENTS, AND SUBJECTING THE BRUSH AND THELEAD OXIDE CONTAINED THEREIN TO A HALOGEN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID ANY HYDROIODIC ACID FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY COMPLETELY CHANGE THE DEPOSITED LEAD OXIDE TO A HALOGENATED LEAD COMPOUND.
References Cited (Backward Citations)
US369091A
Cited
US1620940A
Cited
US1839168A
Cited
US1895756A
Cited
US1991487A
Cited
US2428036A
Cited
US2414514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |