Patents by Inventor Rajiv Ginde

Rajiv Ginde 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).

  • Vinyl pyrrolidone polymers substantially free of vinyl lactam monomers
    Patent number: 5830964
    Abstract: This invention relates to substantially colorless and odorless vinyl lactam polymers containing less than 100 ppm residual vinyl pyrrolidone and less than 1000 ppm vinyl caprolactam monomers and to the process for producing said polymers in the above state of purity which comprises contacting a vinyl pyrrolidone and/or vinyl caprolactam polymer containing excessive residual monomer with between about 0.1 and about 9 wt. % of porous resin having a sulfonic and/or carboxylic functionality wherein said resin has a particle size between 5 and 500 mesh.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: November 3, 1998
    Assignee: ISP Investments Inc.
    Inventors: Kou-chang Liu, Lowell R. Anderson, Rajiv Ginde, Colleen M. Rocafort
  • Reactive extrusion process for making mixed salts of polymers containing an anhydride, acid or ester side groups
    Patent number: 5635568
    Abstract: A process of making a mixed salt of a polymer containing an anhydride, acid or ester side groups therein which comprises:(a) forming a reaction mixture of the polymer, mixed salt compounds and water, in a predetermined proportion, as a paste or slurry,(b) reacting and extruding the paste or slurry at a predetermined temperature to form the mixed salt of the polymer, and(c) drying the resultant reaction product.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: June 3, 1997
    Assignee: ISP Investments Inc.
    Inventors: Krystyna Plochocka, Rajiv Ginde, Jui-Chang Chuang, William E. Prosise