Patent US5557134A successfully refreshed from Google Patents.
Patent US2558520A successfully refreshed from Google Patents.
US2558520A
Expired / Lapsed
US
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Production of acrolein from glycerol
Assignee: U S Ind Chemicals Inc
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Filing: 1948-01-29
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Granted: 1951-06-26
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Expires: 1968-01-29
Abstract
No abstract record available.
Inventors
- 👤 Howard E Hoyt
- 👤 Thomas H Manninen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:05
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/51; C07C45/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD FOR THE PREPARATION OF ACROLEIN BY THE DEHYDRATION OF GLYCEROL WHICH COMPRISES MAINTAINING AT A TEMPERATURE ADAPTED TO EFFECT THE DEHYDRATION OF GLYCEROL TO ACROLEIN A MASS OF INERT, HYDROCARBON LIQUID CONTAINING AS A DEHYDRATION CATALYST A CARRIER WHICH HAS BEEN IMPREGNATED WITH FROM ABOUT 3 TO ABOUT 25 PARTS PER 100 PARTS OF SAID CARRIER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ORTHOPHOSPHORIC ACID METAPHOSPHORIC ACID, PYROPHOSPHORIC ACID AND PHOSPHORUS PENTOXIDE, AND FEEDING FLYCEROL TO SAID MASS OF LIQUID AT A RATE SUBSTANTIALLY EQUAL TO THAT AT WHICH TH EDECOMPOSITION OF THE GLYCEROL OCCURS.
Claim 2
Independent Claim
99 words
THE METHOD FOR THE PREPARATION OF ACROLEIN BY THE DEHYDRATION OF GLYCEROL WHICH COMPRISES MAINTAINING AT A TEMPERATURE ADAPTED TO EFFECT THE DEHYDRATION OF GLYCEROL TO ACROLEIN A MASS OF INERT, HYDROCARBON LIQUID CONTAINING AS A DEHYDRATION CATALYST A CARRIER WHICH HAS BEEN IMPREGNATED WITH FROM ABOUT 3 TO ABOUT 25 PARTS PER 100 PARTS OF SAID CARRIER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ORTHOPHOSPHORIC ACID METAPHOSPHORIC ACID, PYROPHOSPHORIC ACID AND PHOSPHORUS PENTOXIDE, AND FEEDING FLYCEROL TO SAID MASS OF LIQUID AT A RATE SUBSTANTIALLY EQUAL TO THAT AT WHICH TH EDECOMPOSITION OF THE GLYCEROL OCCURS.
References Cited (Backward Citations)
US2042224A
Cited
US2421554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |