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US2200580A
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Purification of liquids by biological means
Assignee: Individual
•
Filing: 1938-02-12
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Granted: 1940-05-14
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Expires: 1958-02-12
Abstract
No abstract record available.
Inventors
- 👤 Pruss Max
- 👤 Blunk Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1231; A; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/84; C02F3/025; C02F3/04; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916; Y10S261/00; Y10S261/72; Y10S435/00; Y10S435/818
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) | 1943-05-14 | 1943-11-13 | 1944-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-14 | 1947-11-13 | 1948-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-14 | 1951-11-13 | 1952-05-14 | $7700.00 | Window Closed / Lapsed |