Patents by Inventor Srinivasa R. Rao

Srinivasa R. Rao 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).

  • Method for preparing mercapto propionic acid esters and polythio dipropionic acid esters
    Patent number: 4067901
    Abstract: A process is provided for the preparation of mercapto propionic acid esters and/or polythio dipropionic acid esters by reaction of an acrylic acid ester with hydrogen sulfide in the presence of a weakly basic amine as a catalyst, a polythiodipropionic acid ester as a reactive solvent, and added elemental sulfur.
    Type: Grant
    Filed: May 11, 1977
    Date of Patent: January 10, 1978
    Assignee: Witco Chemical Corporation
    Inventors: Shaul Gladstone, Srinivasa R. Rao, C. Joseph Rosshirt
  • Method for preparing mercapto propionic acid esters and polythio dipropionic acid esters
    Patent number: 4052440
    Abstract: A process is provided for the preparation of mercapto propionic acid esters and/or polythio dipropionic acid esters by reaction of an acrylic acid ester with hydrogen sulfide in the presence of a weakly basic amine base as a catalyst and a polythiodipropionic acid ester as a reactive solvent.
    Type: Grant
    Filed: September 19, 1975
    Date of Patent: October 4, 1977
    Assignee: Witco Chemical Corporation
    Inventors: Shaul Gladstone, Srinivasa R. Rao, C. Joseph Rosshirt