US2428418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of silica and other impurities from water by precipitation
Assignee: Permutit Co
•
Filing: 1940-07-03
•
Granted: 1947-10-07
•
Expires: 1960-07-03
Abstract
No abstract record available.
Inventors
- 👤 Paul C Goetz
- 👤 Howard L Tiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:20
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; C02F1/52; C02F1/5236; C02F1/5254; C02F5/00; C02F5/02; C02F2101/00; C02F2101/10; C02F2101/12; C02F2101/14; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US206161A
Cited
US1315836A
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US654393A
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GB190212875A
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US1756275A
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US1964487A
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US1823605A
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US1927148A
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US1962096A
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US2021672A
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US2044582A
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US2115188A
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US2128393A
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GB447381A
Cited
GB446374A
Cited
US2127314A
Cited
US2245587A
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US2207725A
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US2182286A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |