US2819989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamoelectric brush
Assignee: Stackpole Carbon Co
•
Filing: 1956-06-26
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Granted: 1958-01-14
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Expires: 1976-06-26
Abstract
No abstract record available.
Inventors
- 👤 Edwin F Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:36
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/04; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20; H01R39/22; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A DYNAMOELECTRIC BRUSH COMPRISING A CARBON BODY IMPREGNATED WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE GLYCOL BORATE AND ETHYLENE GLYCOL BORATE.
Claim 2
Dependent Claim
24 words
A DYNAMOELECTRIC BRUSH COMPRISING A CARBON BODY IMPREGNATED WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE GLYCOL BORATE AND ETHYLENE GLYCOL BORATE.
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |