US2291772A
Expired / Lapsed
US
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Combined flocculation and sedimentation apparatus
Assignee: Dorr Co
•
Filing: 1940-01-24
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Granted: 1942-08-04
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Expires: 1960-01-24
Abstract
No abstract record available.
Inventors
- 👤 Talbot Henry John
- 👤 Franz Carl Wilhelm Anton Popel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:24
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; B01D21/20; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2433; B01D21/2438; B01D21/245; B01D21/30; B01D21/34
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) | 1945-08-03 | 1946-02-02 | 1946-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-03 | 1950-02-02 | 1950-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-03 | 1954-02-02 | 1954-08-04 | $7700.00 | Window Closed / Lapsed |