US2442584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of impurities from liquids by contact with dolomitic lime calcined for 10 to120 minutes at a temperature of 300 u deg. c. to 700 u deg. c., and product therefor
Assignee: Permutit Co
•
Filing: 1942-07-07
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Granted: 1948-06-01
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Expires: 1962-07-07
Abstract
No abstract record available.
Inventors
- 👤 Calmon Calvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:07
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/02; C02F5/06; C02F1/00; C02F1/28; C02F1/281; C02F1/52; C02F1/5236; C02F1/5245; C02F2101/00; C02F2101/10; C02F2101/12; C02F2101/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US283472A
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US1315836A
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SE100590C1
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US705253A
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US773395A
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US1653272A
Cited
US1604126A
Cited
US2207725A
Cited
US2317961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |