Patents by Inventor Richard T. Underwood

Richard T. Underwood 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 a dyed textile fabric wherein the dyed fabric is coated with a mixture of resins
    Patent number: 5976196
    Abstract: An improved method for fixing color of a dyed textile by coating a dyed textile with a mixture of (i) an aminopolyamide-epichlorohydrin resin and (ii) a glyoxylated acrylamide-dimethyl diallyl ammonium chloride resin.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: November 2, 1999
    Assignee: Callaway Corporation
    Inventors: Anthony B Cooper, Richard T. Underwood, Geoffrey A. Monteith, Michael D. Wright
  • Process of after-treating dyed cellulose fabrics with a glyoxalated acrylamide polymer
    Patent number: 5951719
    Abstract: An improved method for fixing color of a dyed textile fabric by coating a dyed textile with an acrylamide polymer which has been reacted with glyoxal at a mole ratio of glyoxal to polymer of at least 0.8:1. Preferably the dyed textile fabric has been pre-coated with an anionic polymer.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: September 14, 1999
    Assignee: Callaway Corporation
    Inventors: Anthony Cooper, Richard T. Underwood, Geoffrey Monteith, Michael Wright
  • Method for imparting strength to paper
    Patent number: 5783041
    Abstract: A method for imparting dry strength to paper by adding to a pulp slurry during a paper-making process a mixed resin solution containing (i) an aminopolyamide-epichlorohydrin resin and (ii) a glyoxylated acrylamide-dimethyl diallyl ammonium chloride resin, in combination with (iii) a high charge density cationic polymer.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: July 21, 1998
    Assignee: Callaway Corporation
    Inventor: Richard T. Underwood
  • Method for imparting strength to paper
    Patent number: 5674362
    Abstract: A method for imparting strength to paper by adding to a pulp slurry during a paper-making process a mixed resin solution containing (i) an aminopolyamide-epichlorohydrin resin and (ii) a glyoxylated acrylamide-dimethyl diallyl ammonium chloride resin.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: October 7, 1997
    Assignee: Callaway Corp.
    Inventors: Richard T. Underwood, Robert J. Jasion, Stephen P. Hoke, Gavin G. Spence