US3050533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of esters
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1958-05-12
•
Granted: 1962-08-21
•
Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 Munro Neil
- 👤 Maclean Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:20
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; C22; C22C; C22C38/00; C22C38/18; C22C38/30; C08G63/78; C08G63/82; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD OF ESTERIFYING TEREPTHHALIC ACID WITH A GLYCOL SELECTED FROM THE CONSISTING OF ETHYLENE GLYCOL AND 1,4-BUTANEDIOL COMPRISING HEATING A MIXTURE CONSISTING ESSENTIALLY OF TEREPHTHALIC ACID AND FROM ONE TO THREE MOLAR PROPORTIONS OF SAID GLYCOL AT A TEMPERATURE BETWEEN THE NORMAL BOILING POINT OF SAID GLYCOL AND 300* C. AND UNDER A SUPERATMOSPHERIC PRESSURE OF AT LEAST ABOUT THE PARTIAL VAPOR PRESSURE OF SAID GLYCOL BUT NOT EXCEEDING THE SUM OF THE PARTIAL VAPOR PRESSURES OF THE SAID GLYCOL AND THE WATER PRODUCED IN THE REACTION, SAID PARTIAL VAPOR PRESSURES BEING THOSE AT THE TEMPERATURE OF THE REACTION.
Claim 2
Independent Claim
100 words
A METHOD OF ESTERIFYING TEREPTHHALIC ACID WITH A GLYCOL SELECTED FROM THE CONSISTING OF ETHYLENE GLYCOL AND 1,4-BUTANEDIOL COMPRISING HEATING A MIXTURE CONSISTING ESSENTIALLY OF TEREPHTHALIC ACID AND FROM ONE TO THREE MOLAR PROPORTIONS OF SAID GLYCOL AT A TEMPERATURE BETWEEN THE NORMAL BOILING POINT OF SAID GLYCOL AND 300* C. AND UNDER A SUPERATMOSPHERIC PRESSURE OF AT LEAST ABOUT THE PARTIAL VAPOR PRESSURE OF SAID GLYCOL BUT NOT EXCEEDING THE SUM OF THE PARTIAL VAPOR PRESSURES OF THE SAID GLYCOL AND THE WATER PRODUCED IN THE REACTION, SAID PARTIAL VAPOR PRESSURES BEING THOSE AT THE TEMPERATURE OF THE REACTION.
References Cited (Backward Citations)
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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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |