Patent US2461814A successfully refreshed from Google Patents.
US2461814A
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US
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Sludge handling and disposal system
Assignee: Whiting Corp
•
Filing: 1945-01-22
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Granted: 1949-02-15
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Expires: 1965-01-22
Abstract
No abstract record available.
Inventors
- 👤 Ernest F Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:40
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0012; B01D21/02; B01D21/24; B01D21/245; B01D21/2472
Claims Analysis
Total Claims: 0
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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) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |