US2617756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery and purification of propionaldehyde
Assignee: Stanolind Oil and Gas Co
•
Filing: 1950-05-20
•
Granted: 1952-11-11
•
Expires: 1970-05-20
Abstract
No abstract record available.
Inventors
- 👤 Theodore Q Eliot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A PROCESS FOR THE RECOVERY OF PROPIONALDEHYDE FROM AQUEOUS MIXTURES THEREOF, THE STEP WHICH COMPRISES SUBJECTING SAID AQUEOUS MIXTURE TO DISTILLATION UNDER SUPERATMOSPHERIC PRESSURE TO OBTAIN AN OVERHEAD OF PROPIONALDEHYDE AND WATER IN THE FORM OF AN AZETROPE CONTAINING SUBSTANTIALLY IN EXCESS OF 2.4 WEIGHT PER CENT WATER AND A BOTTOMS OF SUBSTANTIALLY ANHYDROUS PROPIONALDEHYDE.
Claim 2
Dependent Claim
56 words
IN A PROCESS FOR THE RECOVERY OF PROPIONALDEHYDE FROM AQUEOUS MIXTURES THEREOF, THE STEP WHICH COMPRISES SUBJECTING SAID AQUEOUS MIXTURE TO DISTILLATION UNDER SUPERATMOSPHERIC PRESSURE TO OBTAIN AN OVERHEAD OF PROPIONALDEHYDE AND WATER IN THE FORM OF AN AZETROPE CONTAINING SUBSTANTIALLY IN EXCESS OF 2.4 WEIGHT PER CENT WATER AND A BOTTOMS OF SUBSTANTIALLY ANHYDROUS PROPIONALDEHYDE.
References Cited (Backward Citations)
USRE17157E
Cited
US1446874A
Cited
US1676700A
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US1905290A
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US1911832A
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US2160064A
Cited
US2324255A
Cited
US2485329A
Cited
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 |