Patents by Inventor Robert Benson Rashbrook

Robert Benson Rashbrook 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).

  • Process for preparing polyesters from terephthalic acid in the presence of phosphonium compounds
    Patent number: 3935168
    Abstract: Preparation of fibre-or film-forming polyester or copolyester wherein terephthalic acid or mixture with a second dicarboxylic acid is reacted with glycol and polycondensed with a phosphonium compound having at least one aryl constituent.
    Type: Grant
    Filed: December 12, 1973
    Date of Patent: January 27, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventor: Robert Benson Rashbrook