Patent US2418420A successfully refreshed from Google Patents.
US2418420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating carbon brushes
Assignee: Westinghouse Electric Corp
•
Filing: 1943-02-08
•
Granted: 1947-04-01
•
Expires: 1963-02-08
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Moberly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1620940A
Cited
US1000761A
Cited
US1184135A
Cited
US1626104A
Cited
US1742259A
Cited
US1716461A
Cited
US1779242A
Cited
US1867524A
Cited
US1868206A
Cited
US1895756A
Cited
US1861415A
Cited
US2098062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |