Patents by Inventor Sanjay T. Kulkarni

Sanjay T. Kulkarni 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).

  • Patent number: 7479517
    Abstract: The present invention provides a process for the preparation of Fast Reheat (FRH) bottle grade polyethylene terephthalate (PET) resin by dispersing micron-sized carbon black in monoethylene glycol in the presence of dispersing agents and adding nano-sized particles of ferric oxide and metallic antimony to obtain a mixed carbon slurry followed by the preparation of a polymer slurry of pure terepthalic acid, mono ethylene glycol, isopthalic acid in the presence of a polymerisation catalyst and color toners, said carbon slurry and polymer slurry are added to obtain an addition mixture, which is followed by esterification and polymerisation in the presence of heat stabilizing additives to obtain Fast Reheat (PET) Resin.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: January 20, 2009
    Assignee: Futura Polyesters Ltd.
    Inventors: Sanjay T. Kulkarni, Mavila P. K. Unni
  • Patent number: 7199210
    Abstract: A process for the preparation of polyethylene terephthalate by making use of non antimony catalysts is described. The Ti complex catalyst is pre-dispersed in the polymer matrix selected from PET, PBT, PCTG, PETG, PCT, PEN, PPT, PTT or any other related polyesters and prepared as a master batch. The key feature of the process is that the polyester obtained is having good whiteness, as against the yellowness normally encountered with Ti based catalysts, and also the polyester has very good clarity with minimum haze.
    Type: Grant
    Filed: October 19, 2004
    Date of Patent: April 3, 2007
    Assignee: Futura Polymers, a division of Futura Polyesters Limited
    Inventors: Sanjay T. Kulkarni, Harish Bisht