Patents by Inventor Rita M. Perkins

Rita M. Perkins 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: 4246031
    Abstract: A flame retardant prepolymer composition for imparting flame retardance to cotton, cellulosic textiles, and certain other materials; the process for preparing the prepolymer composition; and the application technique of said prepolymer composition are disclosed. Tetrakis(hydroxymethyl)phosphonium sulfate, a THP salt, is acidified, ammonia gas is bubbled into the mixture to achieve a constant boiling, these steps are repeated a number of times, and the prepolymer mixture thus prepared is then applied to a substrate, followed by treatment with a caustic solution.
    Type: Grant
    Filed: October 11, 1978
    Date of Patent: January 20, 1981
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Galoust M. Elgal, Rita M. Perkins, Nestor B. Knoepfler