US2656475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical machine brush and method of prolonging its life
Assignee: Stackpole Carbon Co
•
Filing: 1952-12-19
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Granted: 1953-10-20
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Expires: 1972-12-19
Abstract
No abstract record available.
Inventors
- 👤 John E Diehl
- 👤 Smisko Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:43
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A BRUSH HAVING A CONTACT SURFACE ADAPTED TO ENGAGE A ROTATING CURRENT-COLLECTING RING, THE BRUSH HAVING POLYFLUOROETHYLENE RESIN AT SAID SURFACE.
Claim 2
Dependent Claim
21 words
A BRUSH HAVING A CONTACT SURFACE ADAPTED TO ENGAGE A ROTATING CURRENT-COLLECTING RING, THE BRUSH HAVING POLYFLUOROETHYLENE RESIN AT SAID SURFACE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |