Patent US4757693A successfully refreshed from Google Patents.
Patent US2295256A successfully refreshed from Google Patents.
US2295256A
Expired / Lapsed
US
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Process and device for fractional distillation of liquid mixtures, more particularlypetroleum
Assignee: Individual
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Filing: 1940-08-23
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Granted: 1942-09-08
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Expires: 1960-08-23
Abstract
No abstract record available.
Inventors
- 👤 Brugma Antoine Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:38
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/143; B01D3/146; C; C10; C10G; C10G7/00
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) | 1945-09-07 | 1946-03-09 | 1946-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-07 | 1950-03-09 | 1950-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-07 | 1954-03-09 | 1954-09-08 | $7700.00 | Window Closed / Lapsed |