Patent US2500329A successfully refreshed from Google Patents.
US2500329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation of 1-butanol from methyl nu-butyl ketone
Assignee: Stanolind Oil and Gas Co
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Filing: 1948-11-18
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Granted: 1950-03-14
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Expires: 1968-11-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Alfred Steltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
IN A PROCESS FOR SEPARATING 1-BUTANOL FROM METHYL N-BUTYL KETONE, THE STEPS WHICH COMPRISE FRACTIONALLY DISTILLING A MIXTURE THEREOF IN THE PRESENCE OF A C7 HYDROCARBON AND SEPARATING AN OVERHEAD FRACTION COMPRISING 1-BUTANOL SUBSTANTIALLY FREE FROM METHYL N-BUTYL KETONE.
Claim 2
Dependent Claim
39 words
IN A PROCESS FOR SEPARATING 1-BUTANOL FROM METHYL N-BUTYL KETONE, THE STEPS WHICH COMPRISE FRACTIONALLY DISTILLING A MIXTURE THEREOF IN THE PRESENCE OF A C7 HYDROCARBON AND SEPARATING AN OVERHEAD FRACTION COMPRISING 1-BUTANOL SUBSTANTIALLY FREE FROM METHYL N-BUTYL KETONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |