US1938894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thickener
Assignee: Dorr Co
•
Filing: 1931-05-07
•
Granted: 1933-12-12
•
Expires: 1951-05-07
Abstract
No abstract record available.
Inventors
- 👤 George M Darby
- 👤 Ernest J Maust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:24
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0018; B01D21/0039; B01D21/0042; B01D21/10; B01D21/12; B01D21/14; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2433; B01D21/2438; 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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |