Patent US897039A successfully refreshed from Google Patents.
US897039A
Expired / Lapsed
US
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Process for purifying and filtering water.
Assignee: Individual
•
Filing: 1907-04-23
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Granted: 1908-08-25
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Expires: 1927-04-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred Vogelsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:55
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/06
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) | 1911-08-25 | 1912-02-24 | 1912-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-08-25 | 1916-02-24 | 1916-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-08-25 | 1920-02-24 | 1920-08-25 | $7700.00 | Window Closed / Lapsed |