US2617757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation of ketone-containing alcohols
Assignee: Stanolind Oil and Gas Co
•
Filing: 1947-08-02
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Granted: 1952-11-11
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Expires: 1967-08-02
Abstract
No abstract record available.
Inventors
- 👤 Vesta F Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:40
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: 1
Claim 1
Independent Claim
46 words
IN A PROCESS FOR SEPARATING A PURIFIED ALCOHOL FROM A MIXTURE CONSISTING ESSENTIALLY OF METHYL PROPYL KETONE AND AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETHANOL AND N-PROPYL ALCOHOL, THE STEPS WHICH COMPRISE FRACTIONALLY DISTILLING SAID MIXTURE IN THE PRESENCE OF WATER AND A HYDRO-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |