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Patent US3356712A successfully refreshed from Google Patents.
US3356712A
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Process for the preparation of aryl esters of carbocyclic aromatic carboxylic acids
Assignee: Chemische Werke Witten GmbH
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Filing: 1963-02-12
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Granted: 1967-12-05
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Expires: 1983-02-12
Abstract
No abstract record available.
Inventors
- 👤 Renckhoff Gustav
- 👤 Hulsmann Hans Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C07; C07C; C07C67/00; C07C67/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR THE PREPARATION OF AN ARYL ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF CARBOCYCLIC AROMATIC MONO- AND POLYCARBOXYLIC ACIDS AND HALO- AND ALKYL-SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES HEATING THE METHYL ESTER OF SAID ACID IN THE PRESENCE OF AN ACIDIC, ALKALINE OR METALLIC SALT TRANSESTERIFICATION CATALYST WITH AT LEAST AN EQUIVALENT AMOUNT OF A PHENOLIC COMPONENT TO A TEMPERATURE BETWEEN APPROXIMATELY 180* AND 250*C., SAID PHENOLIC COMPONENT BEING SELECTED FROM THE GROUP CONSISTING OF PHENOL, NAPHTHOL AND SUBSTITUTED PHENOLS AND NAPHTHOLS, SAID SUBSTITUTED PHENOLS AND NAPHTHOLS BEING SUBSTITUTED BY ONE OR MORE GROUPS SELECTED FROM THE GROUP CONSISTING OF THE ALKYL AND ARALKYL RADICALS, AND CONTINUOUSLY REMOVING THE METHYL ALCOHOL FORMED BY THE REACTION BETWEEN SAID METHYL ESTER AND PHENOLIC COMPONENT FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
130 words
A PROCESS FOR THE PREPARATION OF AN ARYL ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF CARBOCYCLIC AROMATIC MONO- AND POLYCARBOXYLIC ACIDS AND HALO- AND ALKYL-SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES HEATING THE METHYL ESTER OF SAID ACID IN THE PRESENCE OF AN ACIDIC, ALKALINE OR METALLIC SALT TRANSESTERIFICATION CATALYST WITH AT LEAST AN EQUIVALENT AMOUNT OF A PHENOLIC COMPONENT TO A TEMPERATURE BETWEEN APPROXIMATELY 180* AND 250*C., SAID PHENOLIC COMPONENT BEING SELECTED FROM THE GROUP CONSISTING OF PHENOL, NAPHTHOL AND SUBSTITUTED PHENOLS AND NAPHTHOLS, SAID SUBSTITUTED PHENOLS AND NAPHTHOLS BEING SUBSTITUTED BY ONE OR MORE GROUPS SELECTED FROM THE GROUP CONSISTING OF THE ALKYL AND ARALKYL RADICALS, AND CONTINUOUSLY REMOVING THE METHYL ALCOHOL FORMED BY THE REACTION BETWEEN SAID METHYL ESTER AND PHENOLIC COMPONENT FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
GB810381A
Cited
US3012049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |