Patent US421469A successfully refreshed from Google Patents.
US421469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walter ernest adeney and llewellyn
Assignee: —
•
Filing: —
•
Granted: 1890-02-18
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Expires: 1907-02-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:07
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; C25B11/044; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
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) | 1893-02-17 | 1893-08-19 | 1894-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-02-17 | 1897-08-19 | 1898-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-02-18 | 1901-08-20 | 1902-02-19 | $7700.00 | Window Closed / Lapsed |