US3276973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of ketones from acid solutions by distillation in the presence of an aqueous alkali
Assignee: Eastman Kodak Co
•
Filing: 1963-03-01
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Granted: 1966-10-04
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Expires: 1983-03-01
Abstract
No abstract record available.
Inventors
- 👤 Chester F Burmaster
- 👤 Joseph C Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:40
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE METHOD OF CONTINUOUSLY RECOVERING NEUTRAL METHYL ISOBUTYL KETONE FROM A MIXTURE ESSENTIALLY CONSISTING OF METHYL ISOBUTYL KETONE AND ACID WHICH COMPRISES CONTINUOUSLY FEEDING SAID MIXTURE INTO A FRACTIONAL DISTILLATION COLUMN, CONTINUOUSLY DISTILLING SAID MIXTURE, CONTINUOUSLY CONTACTING THE DISTILLATE VAPORS WITH A COUNTER CURRENT STREAM OF AQUEOUS ALKALI, CONTINUOUSLY CONDENSING THE DISTILLATE STREAM, AND CONTINUOUSLY DECANTING THE NEUTRAL METHYL ISOBUTYL KETONE.
Claim 2
Independent Claim
61 words
THE METHOD OF CONTINUOUSLY RECOVERING NEUTRAL METHYL ISOBUTYL KETONE FROM A MIXTURE ESSENTIALLY CONSISTING OF METHYL ISOBUTYL KETONE AND ACID WHICH COMPRISES CONTINUOUSLY FEEDING SAID MIXTURE INTO A FRACTIONAL DISTILLATION COLUMN, CONTINUOUSLY DISTILLING SAID MIXTURE, CONTINUOUSLY CONTACTING THE DISTILLATE VAPORS WITH A COUNTER CURRENT STREAM OF AQUEOUS ALKALI, CONTINUOUSLY CONDENSING THE DISTILLATE STREAM, AND CONTINUOUSLY DECANTING THE NEUTRAL METHYL ISOBUTYL KETONE.
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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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |