Patent US2263766A successfully refreshed from Google Patents.
US2263766A
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Sludge coking process
Assignee: Standard Oil Co
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Filing: 1938-11-09
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Granted: 1941-11-25
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Expires: 1958-11-09
Abstract
No abstract record available.
Inventors
- 👤 Carroll D Fentress
- 👤 Clande P Mcneil
- 👤 Edwin G Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:25
CPC Classifications
C; C10; C10B; C10B55/00; C10B55/02; C10B55/04
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) | 1944-11-24 | 1945-05-26 | 1945-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-11-24 | 1949-05-26 | 1949-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-11-24 | 1953-05-26 | 1953-11-25 | $7700.00 | Window Closed / Lapsed |