Patent US2873292A successfully refreshed from Google Patents.
US2873292A
Expired / Lapsed
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⏱️ 0.0 years remaining
Preparation of methyl and ethyl esters of aromatic carboxylic acids
Assignee: Standard Oil Co
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Filing: 1957-05-31
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Granted: 1959-02-10
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Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Delbert H Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:37
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A NON-CATALYTIC PROCESS FOR MAKING DIALKYLPHTHALATES WHICH COMPRISES CONTACTING A PHTHALIC ACID, AN ALKYLGROUP AFFORDING ALCOHOL SELECTED FROM THE CLASS CONSISTING OF METHANOL AND ETHANOL, IN A MOLAR RATIO OF ALCOHOL TO ACID OF BETWEEN ABOUT 3 AND 50, AT A TEMPERATURE BETWEEN ABOUT 260* C. AND 350* C., SAID CONTACTING ZONE CONTAINING ADDED ALKYLPHTHALATE ESTER IN AN AMOUNT BETWEEN ABOUT 35 AND 50 PARTS BY WEIGHT PER 100 PARTS OF SAID PHTHALIC ACID REACTANT CHARGED, FOR A TIME SUCH THAT SUBSTANTIALLY EQUILIBRIUM CONVERSION OF CARBOXYL GROUPS PRESENT IN THE CONTACTING ZONE IS ATTAINED AND SEPARATING DIALKYL PHTHALATE FROM UNREACTED ALCOHOL.
Claim 2
Dependent Claim
101 words
A NON-CATALYTIC PROCESS FOR MAKING DIALKYLPHTHALATES WHICH COMPRISES CONTACTING A PHTHALIC ACID, AN ALKYLGROUP AFFORDING ALCOHOL SELECTED FROM THE CLASS CONSISTING OF METHANOL AND ETHANOL, IN A MOLAR RATIO OF ALCOHOL TO ACID OF BETWEEN ABOUT 3 AND 50, AT A TEMPERATURE BETWEEN ABOUT 260* C. AND 350* C., SAID CONTACTING ZONE CONTAINING ADDED ALKYLPHTHALATE ESTER IN AN AMOUNT BETWEEN ABOUT 35 AND 50 PARTS BY WEIGHT PER 100 PARTS OF SAID PHTHALIC ACID REACTANT CHARGED, FOR A TIME SUCH THAT SUBSTANTIALLY EQUILIBRIUM CONVERSION OF CARBOXYL GROUPS PRESENT IN THE CONTACTING ZONE IS ATTAINED AND SEPARATING DIALKYL PHTHALATE FROM UNREACTED ALCOHOL.
References Cited (Backward Citations)
US2618651A
Cited
US2578312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |