US2440258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of petroleum distillates
Assignee: California Research LLC
•
Filing: 1945-08-08
•
Granted: 1948-04-27
•
Expires: 1965-08-08
Abstract
No abstract record available.
Inventors
- 👤 Laverne P Elliott
- 👤 Melvin M Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:31
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US911553A
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US1964953A
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US1988793A
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US2320629A
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US2366743A
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US2343744A
Cited
US2375675A
Cited
US2349473A
Cited
US2378762A
Cited
US2343841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |