US2574935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of saturated from unsaturated aldehydes
Assignee: Shell Development Co
•
Filing: 1950-02-04
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Granted: 1951-11-13
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Expires: 1970-02-04
Abstract
No abstract record available.
Inventors
- 👤 Gino J Pierotti
- 👤 Arthur E Handios
- 👤 Charles M Reider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:22
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE PROCESS FOR SEPARATING ACROLEIN FROM A MIXTURE CONTAINING SAID ACROLEIN IN ADMIXTURE WITH PROPIONALDEHYDE WHEREIN SAID MIXTURE IS SUBJECTED TO AN EXTRACTIVE SEPARATION AT A TEMPERATURE OF FROM ABOUT -10 TO 35* C. USING WATER AS A SOLVENT, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID WATER A MINERAL ACID IN CONTROLLED AMOUNT TO MAINTAIN THE HYDROGEN ION CONCENTRATION IN SAID WATER IN THE RANGE OF FROM ABOUT 1.0 TO ABOUT 5.0 IN TERMS OF PH VALUES.
Claim 2
Dependent Claim
78 words
IN THE PROCESS FOR SEPARATING ACROLEIN FROM A MIXTURE CONTAINING SAID ACROLEIN IN ADMIXTURE WITH PROPIONALDEHYDE WHEREIN SAID MIXTURE IS SUBJECTED TO AN EXTRACTIVE SEPARATION AT A TEMPERATURE OF FROM ABOUT -10 TO 35* C. USING WATER AS A SOLVENT, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID WATER A MINERAL ACID IN CONTROLLED AMOUNT TO MAINTAIN THE HYDROGEN ION CONCENTRATION IN SAID WATER IN THE RANGE OF FROM ABOUT 1.0 TO ABOUT 5.0 IN TERMS OF PH VALUES.
References Cited (Backward Citations)
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US2179991A
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US2261704A
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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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |