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US423912A
Expired / Lapsed
US
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Com m utato r-bru sh
Assignee: —
•
Filing: —
•
Granted: 1890-03-25
•
Expires: 1907-03-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:41
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/148; Y; Y10; Y10S; Y10S200/00; Y10S200/29
Claims Analysis
Total Claims: 0
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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) | 1893-03-24 | 1893-09-23 | 1894-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-03-24 | 1897-09-23 | 1898-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-03-25 | 1901-09-24 | 1902-03-26 | $7700.00 | Window Closed / Lapsed |