Patent US1806471A successfully refreshed from Google Patents.
US1806471A
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US
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Method of filtering and apparatus therefor
Assignee: Individual
•
Filing: 1928-02-24
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Granted: 1931-05-19
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Expires: 1948-02-24
Abstract
No abstract record available.
Inventors
- 👤 Simon P Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0083; B01D71/00; B01D71/02; B01D71/024; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/041; B01J20/10; B01J20/28; B01J20/28014; B01J20/2805; B01J20/30; B01J20/3078
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) | 1934-05-18 | 1934-11-17 | 1935-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-05-18 | 1938-11-17 | 1939-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-05-18 | 1942-11-17 | 1943-05-19 | $7700.00 | Window Closed / Lapsed |