Patent US3053883A successfully refreshed from Google Patents.
US3053883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of metal salts to promote esterification
Assignee: Imperial Chemical Industries Ltd
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Filing: 1961-06-19
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Granted: 1962-09-11
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Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 Dean Fred
- 👤 Cotterill Colin Bertie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:23
CPC Classifications
B; B01; B01J; B01J27/00; C; C07; C07C; C07C69/00; C07C69/76; C07C69/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PROCESS FOR THE PRODUCTION OF ESTERS WHICH COMPRISES REACTING AT AN ELEVATED TEMPERATURE AND IN THE PRESENCE OF A MINERAL ACID-TYPE CATALYST AN ALCOHOL WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CARBOXYLIC ACIDS AND ANHYDRIDES THEREOF AND WHEREIN THE REACTION PRODUCES A COLOR FORMATION, THE IMPROVEMENT COMPRISING CONDUCTING SAID REACTION IN THE PRESENCE OF AT LEAST 0.5% BY WEIGHT OF THE REACTANTS OF A METAL SALT SELECTED FROM THE GROUP CONSISTING OF COPPER, IRON, TIN, AND CHROMIUM SALTS, THE SAID SALT HAVING A GREATER AFFINITY FOR OXYGEN THAN THAT POSSESSED BY THE OXIDIZABLE IMPURITIES PRESENT IN THE REACTION SYSTEM AND BEING INSUFFICIENTLY ACTIVE TO CATALYZE THE OXIDATION OF SAID IMPURITIES, WHEREBY A SUBSTANTIALLY COLORLESS ESTER AS AN END PRODUCT OF THE REACTION.
Claim 2
Dependent Claim
126 words
IN A PROCESS FOR THE PRODUCTION OF ESTERS WHICH COMPRISES REACTING AT AN ELEVATED TEMPERATURE AND IN THE PRESENCE OF A MINERAL ACID-TYPE CATALYST AN ALCOHOL WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CARBOXYLIC ACIDS AND ANHYDRIDES THEREOF AND WHEREIN THE REACTION PRODUCES A COLOR FORMATION, THE IMPROVEMENT COMPRISING CONDUCTING SAID REACTION IN THE PRESENCE OF AT LEAST 0.5% BY WEIGHT OF THE REACTANTS OF A METAL SALT SELECTED FROM THE GROUP CONSISTING OF COPPER, IRON, TIN, AND CHROMIUM SALTS, THE SAID SALT HAVING A GREATER AFFINITY FOR OXYGEN THAN THAT POSSESSED BY THE OXIDIZABLE IMPURITIES PRESENT IN THE REACTION SYSTEM AND BEING INSUFFICIENTLY ACTIVE TO CATALYZE THE OXIDATION OF SAID IMPURITIES, WHEREBY A SUBSTANTIALLY COLORLESS ESTER AS AN END PRODUCT OF THE REACTION.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |