Patents by Inventor Nipun M. Shah

Nipun M. Shah 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).

  • Catalyst system for a polyethylene terephthalate polycondensation
    Patent number: 4356299
    Abstract: A polyethylene terephthalate polycondensation catalyst system comprises from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.
    Type: Grant
    Filed: February 4, 1982
    Date of Patent: October 26, 1982
    Assignee: Rohm and Haas Company
    Inventors: Michael S. Cholod, Nipun M. Shah
  • Process for the continuous polymerization of polyethylene terephthalate in the solid phase
    Patent number: 4271287
    Abstract: Amorphous polyethylene terephthalate can be polycondensed in the solid phase to a higher molecular weight product by a continuous process involving preheating the polymer under forced motion, at least partially crystallizing the preheated polymer in a fixed bed, and polycondensing the polymer in a forced motion reactor at temperatures in the range of 220.degree. to 245.degree. C.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: June 2, 1981
    Assignee: Rohm and Haas Company
    Inventor: Nipun M. Shah