Patents by Inventor Thirmurti Narayan

Thirmurti Narayan 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).

  • Polyisocyanate prepolymer compositions and soft elastomers prepared therefrom
    Patent number: 5872193
    Abstract: A polyisocyanate prepolymer composition which comprises the reaction product of a) diphenylmethane diisocyanate composition and b) an active hydrogen containing compound having a number average molecular weight of at least about 2000 wherein the reaction is carried out in the presence of a diluent capable of maintaining the average viscosity of the resulting prepolymer below about 500 cps at 25.degree. C. The prepolymer may be reacted with a resin composition to prepare soft elastomers.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: February 16, 1999
    Assignee: BASF Corporation
    Inventors: Thirmurti Narayan, Gary Brant