US3377376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase esterification of terephthalic acid in the presence of alkali metal impregnated catalyst
Assignee: Mobil Oil AS
•
Filing: 1966-02-07
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Granted: 1968-04-09
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Alvis B Gainer
- 👤 Laurence E Mcmakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:09
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
48 words
A METHOD FOR PREPARING DIESTERS OF TEREPHTHALIC ACID WHICH COMPRISES CONTACTING A VAPOR MIXTURE COMPRISING TEREPHTHALIC ACID AND AN ALIPHATIC ALCOHOL OF 1-4 CARBON ATOMS WITH A PARTICULATE SOLIE ESTERIFICATION CATALYST CONTAINING AT LEAST 0.2% ALKALI METAL IMPREGNATED THEREIN, AND RECOVERING THE RESULTANT DIESTER FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
48 words
A METHOD FOR PREPARING DIESTERS OF TEREPHTHALIC ACID WHICH COMPRISES CONTACTING A VAPOR MIXTURE COMPRISING TEREPHTHALIC ACID AND AN ALIPHATIC ALCOHOL OF 1-4 CARBON ATOMS WITH A PARTICULATE SOLIE ESTERIFICATION CATALYST CONTAINING AT LEAST 0.2% ALKALI METAL IMPREGNATED THEREIN, AND RECOVERING THE RESULTANT DIESTER FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2806052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |