Patent US809089A successfully refreshed from Google Patents.
US809089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making caustic alkali.
Assignee: Individual
•
Filing: 1905-05-10
•
Granted: 1906-01-02
•
Expires: 1925-05-10
Abstract
No abstract record available.
Inventors
- 👤 Henry Spencer Blackmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
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) | 1909-01-01 | 1909-07-03 | 1910-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1913-01-01 | 1913-07-03 | 1914-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1917-01-01 | 1917-07-03 | 1918-01-02 | $7700.00 | Window Closed / Lapsed |