Patents by Inventor Arun K. Mandal

Arun K. Mandal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 4-hydroxyphenyl acetic acid
    Patent number: 5145994
    Abstract: A process for the preparation of 4-hydroxyphenyl acetic acid of the formula I, an important raw material for the preparation of pharmaceutically active substances, from sodium-4-hydroxymandalate monohydrate comprising reducing the sodium-4-hydroxymandalate monohydrate with a reducing agent consisting of stoichiometric quantity of a phosphorus (III) compound and catalytic or stoichiometric quantity of sulphur dioxide or equivalent salt thereof in a solvent at 60.degree.-120.degree. C. and at ambient to 5 atmospheres pressures.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: September 8, 1992
    Assignee: ICI India Limited
    Inventors: Arun K. Mandal, Satish W. Mahajan, Damodar G. Jawalkar
  • Process for the production of a (1R,Cis)-4 acetyl-6,6-dimethyl-3-oxabicyclo-(3.1.0.)-hex-2-one
    Patent number: 4680418
    Abstract: A process for the production of (1R,Cis)-4-acetyl-6, 6-dimethyl-3-oxabicyclo-(3.1.0.)-hex-2-one of the formula: ##STR1## which involves reacting (1R,Cis)-4,7,7-trimethyl-3-oxabicyclo-(4.1.0.)-hept-4-en-2-one of the formula: ##STR2## with bromine at a temperature of from 0.degree. C. to 25.degree. C. and treating the brominated reaction mixture at ambient temperature with water, an aqueous solvent solution or an aqueous base solution.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: July 14, 1987
    Assignee: IEL Limited
    Inventors: Arun K. Mandal, Damodar G. Jawalkar, Satish W. Mahajan
  • Process for the manufacture of optically active .gamma.-lactone of (1R, cis)-2, 2-dimethyl-3-hydroxymethyl-cyclopropane-1-carboxylic acid
    Patent number: 4568758
    Abstract: The optically active .gamma.-lactone of (1R, cis)-2, 2-dimethyl-3-hydroxymethyl-cyclopropane-1-carboxylic acid, which is useful as an intermediate in the production of pyrethroid insecticides, may be made from optically active (-)car-3-en-5-one by a two stage oxidation process followed by hydrolysis of the intermediate obtained.
    Type: Grant
    Filed: December 29, 1983
    Date of Patent: February 4, 1986
    Assignees: Indian Explosives Limited, The Alkali and Chemical Corporation of India, Chemicals and Fibres of India Limited
    Inventors: Arun K. Mandal, Shailendra R. Bhandari, Satish W. Mahajan