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US2023295A
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Sludge digesting tank
Assignee: Dorr Co
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Filing: 1930-01-21
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Granted: 1935-12-03
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Expires: 1950-01-21
Abstract
No abstract record available.
Inventors
- 👤 Henry L Thackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:11
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/50; B01F27/00; B01F27/05; B01F27/11; B01F27/118; B01F27/80; C; C02; C02F; C02F3/00; C02F3/28
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) | 1938-12-02 | 1939-06-03 | 1939-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-12-02 | 1943-06-03 | 1943-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-12-02 | 1947-06-03 | 1947-12-03 | $7700.00 | Window Closed / Lapsed |