US 4,582,925 AGranted

Tetramethylbiphenylcarboxylic acids and derivatives thereof

AssigneeStandard Oil Company (Indiana)

InventorJohn A. Donohue

Life of this patent

Estimating the term…

Abstract

2,2',6,6'-Tetramethyl-4,4'-dicarboxylic acid is prepared by the oxidation of bimesityl and derivatives of the dicarboxylic acid are used in the preparation of polyesters of high molecular weight.

Claims7

Dependent claims

A compound selected from the group consisting of 2,2',6,6'-tetramethylbiphenyl-4,4'-diacyl halide and diester of 2,2',6,6'-tetramethylbiphenyl-4,4'-dicarboxylic acid containing from 2 to 24 carbon atoms in each ester moiety.

Dependencies are inferred from the claim text.

Facts

Application: 06/263,900Filed 15 May 1981 · division
Priority: 24 Oct 1974
Granted: 15 Apr 1986
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08G 69/26
Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids: derived from polyamines and polycarboxylic acids
C07C 63/333
With all carboxyl groups bound to non-condensed rings: 4,4' - Diphenyldicarboxylic acids
C08G 63/185
Acids containing aromatic rings: containing two or more aromatic rings
C08G
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds

Family

Serial515,506Parent of this continuation-in-part · filed 24 Oct 1974
Serial622,649Parent of this continuation · filed 15 Oct 1975
Serial60,907Parent of this division · filed 26 Jul 1979
US 4,582,925 AThis patent

From the US filing history. Foreign family members aren’t listed.

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