Patent US2160838A successfully refreshed from Google Patents.
US2160838A
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US
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Sedimentation
Assignee: Dorr Co
•
Filing: 1935-01-25
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Granted: 1939-06-06
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Expires: 1955-01-25
Abstract
No abstract record available.
Inventors
- 👤 Dorr John Van Nostrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0024; B01D21/0039; B01D21/0042; B01D21/02; B01D21/04; B01D21/24; B01D21/2405; B01D21/2444; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87708; Y10T137/87732
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) | 1942-06-05 | 1942-12-05 | 1943-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-05 | 1946-12-05 | 1947-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-05 | 1950-12-05 | 1951-06-06 | $7700.00 | Window Closed / Lapsed |