Patent US3010991A successfully refreshed from Google Patents.
US3010991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic esterification of aromatic carboxylic acids
Assignee: Standard Oil Co
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Filing: 1959-01-22
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Granted: 1961-11-28
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Expires: 1979-01-22
Abstract
No abstract record available.
Inventors
- 👤 Delbert H Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:31
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR PREPARING DIMETHYL TEREPHTHALATE BY REACTING TEREPHTHALIC ACID WITH METHANOL AT A TEMPERATURE BETWEEN ABOUT 140*C. AND 350*C. AND AT A PRESSURE OF AT LEAST ATMOSPHERIC, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID REACTION IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF CUPRIC OXIDE, MANGANOUS OXIDE, CUPRIC SALTS OF ACIDS HAVING IONIZATION CONSTANTS LOWER THAN 10*-3, AND MANGANOUS SALTS OF ACIDS HAVING IONIZATION CONSTANTS LOWER THAN 10**-3.
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR PREPARING DIMETHYL TEREPHTHALATE BY REACTING TEREPHTHALIC ACID WITH METHANOL AT A TEMPERATURE BETWEEN ABOUT 140*C. AND 350*C. AND AT A PRESSURE OF AT LEAST ATMOSPHERIC, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID REACTION IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF CUPRIC OXIDE, MANGANOUS OXIDE, CUPRIC SALTS OF ACIDS HAVING IONIZATION CONSTANTS LOWER THAN 10*-3, AND MANGANOUS SALTS OF ACIDS HAVING IONIZATION CONSTANTS LOWER THAN 10**-3.
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) | 1964-11-27 | 1965-05-29 | 1965-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-27 | 1969-05-29 | 1969-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-27 | 1973-05-29 | 1973-11-28 | $7700.00 | Window Closed / Lapsed |