Patent US2501042A successfully refreshed from Google Patents.
US2501042A
Expired / Lapsed
US
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Production of propionaldehyde
Assignee: Celanese Corp
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Filing: 1947-04-14
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Granted: 1950-03-21
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Expires: 1967-04-14
Abstract
No abstract record available.
Inventors
- 👤 James L Gear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:14
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/51; C07C45/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PROCESS FOR THE CATALYTIC VAPOR PHASE DEHYDRATION OF 1,2-PROPYLENE GLYCOL TO PROPIONALDEHYDE, WHICH CONSISTS ESSENTIALLY IN VAPORIZING A 10 TO 20% BY WEIGHT AQUEOUS SOLUTION OF 1,2PROPYLENE GLYCOL, AND PASSING SAID VAPORS OVER A DEHYDRATION CATALYST COMPRISING A MIXTURE OF ABOUT EQUAL PARTS BY WEIGHT OF MON-SODIUM PHOSPHATE AND SILICON DIOXIDE AT A REACTION TEMPERATURE OF ABOUT 800 TO 1100*F. AND AT A SPACE VELOCITY OF 30 TO 60.
Claim 2
Dependent Claim
69 words
PROCESS FOR THE CATALYTIC VAPOR PHASE DEHYDRATION OF 1,2-PROPYLENE GLYCOL TO PROPIONALDEHYDE, WHICH CONSISTS ESSENTIALLY IN VAPORIZING A 10 TO 20% BY WEIGHT AQUEOUS SOLUTION OF 1,2PROPYLENE GLYCOL, AND PASSING SAID VAPORS OVER A DEHYDRATION CATALYST COMPRISING A MIXTURE OF ABOUT EQUAL PARTS BY WEIGHT OF MON-SODIUM PHOSPHATE AND SILICON DIOXIDE AT A REACTION TEMPERATURE OF ABOUT 800 TO 1100*F. AND AT A SPACE VELOCITY OF 30 TO 60.
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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |