US2449610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of butanes and butenes with acetone solvent
Assignee: Standard Oil Development Co
•
Filing: 1943-04-01
•
Granted: 1948-09-21
•
Expires: 1963-04-01
Abstract
No abstract record available.
Inventors
- 👤 John D Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:05
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937786A
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US1612164A
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US1850836A
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US2205996A
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US2302319A
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US2320461A
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US2290636A
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US2312912A
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US2377049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |