Patent US1726745A successfully refreshed from Google Patents.
US2991983A
Expired / Lapsed
US
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Sludge treatment
Assignee: Dorr Oliver Inc
•
Filing: 1956-09-21
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Granted: 1961-07-11
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Expires: 1976-09-21
Abstract
No abstract record available.
Inventors
- 👤 Robert P Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:43
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2866; C02F3/2873
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1767227A
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Cited
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US2772233A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |