US2352772A
Expired / Lapsed
US
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Treatment of impure liquids
Assignee: Dorr Co
•
Filing: 1937-05-18
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Granted: 1944-07-04
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Expires: 1957-05-18
Abstract
No abstract record available.
Inventors
- 👤 George M Darby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; B; B01; B01D; B01D21/00; B01D21/0018; B01D21/003; B01D21/0039; B01D21/0042; B01D21/10; B01D21/12; B01D21/14; B01D21/16; B01D21/18; B01D21/186; B01D21/24; B01D21/2405; B01D21/2427; B01D21/245
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) | 1947-07-04 | 1948-01-03 | 1948-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-04 | 1952-01-03 | 1952-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-04 | 1956-01-03 | 1956-07-04 | $7700.00 | Window Closed / Lapsed |