Patent US2874842A successfully refreshed from Google Patents.
US2874842A
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US
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Process and apparatus for waste liquid purification
Assignee: Individual
•
Filing: 1955-04-05
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Granted: 1959-02-24
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Expires: 1975-04-05
Abstract
No abstract record available.
Inventors
- 👤 Krofta Milos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:36
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/08; D; D21; D21F; D21F1/00; D21F1/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US826411A
Cited
GB124551A
Cited
US1717223A
Cited
US1851172A
Cited
USRE21109E
Cited
US2122310A
Cited
US2439633A
Cited
US2446655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |