Patent US2780643A successfully refreshed from Google Patents.
US2780643A
Expired / Lapsed
US
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Production of water-clear phthalic acid esters from alcohols
Assignee: Ruhrchemie AG
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Filing: 1951-07-24
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Granted: 1957-02-05
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Expires: 1971-07-24
Abstract
No abstract record available.
Inventors
- 👤 Buchner Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:09
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
METHOD FOR THE PREPARATION OF WATER-CLEAR PHTHALATE PLASTICISERS FROM SYNTHETIC ALCOHOLS OBTAINED FROM THE CATALYTIC HYDROGENATION OF CARBON MONOXIDE CONTAINING IMPURITIES, INCLUDING OLEFINS, ALDEHYDES AND ESTERS, WHICH COMPRISES SUBJECTING SUCH A SYNTHETIC ALCOHOL TO A HYDROGENATION IN THE PRESENCE OF A HYDROGENATION CATALYST AND WATER AT A TEMPERATURE OF ABOUT 160-230*C. FOR THE HYDROGENATIN OF THE IMPURITIES, THEREAFTER ESTERIFYING THE SYNTHETIC ALCOHOL WITH PHTHALIC ACID, AND RECOVERING A WATER-CLEAR PHTHALATE.
Claim 2
Dependent Claim
70 words
METHOD FOR THE PREPARATION OF WATER-CLEAR PHTHALATE PLASTICISERS FROM SYNTHETIC ALCOHOLS OBTAINED FROM THE CATALYTIC HYDROGENATION OF CARBON MONOXIDE CONTAINING IMPURITIES, INCLUDING OLEFINS, ALDEHYDES AND ESTERS, WHICH COMPRISES SUBJECTING SUCH A SYNTHETIC ALCOHOL TO A HYDROGENATION IN THE PRESENCE OF A HYDROGENATION CATALYST AND WATER AT A TEMPERATURE OF ABOUT 160-230*C. FOR THE HYDROGENATIN OF THE IMPURITIES, THEREAFTER ESTERIFYING THE SYNTHETIC ALCOHOL WITH PHTHALIC ACID, AND RECOVERING A WATER-CLEAR PHTHALATE.
References Cited (Backward Citations)
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US1993736A
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US2043688A
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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) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |