Patents by Inventor Patricia B. Walsh

Patricia B. Walsh 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 the delignification of a chemical paper pulp with organic peroxy acid
    Patent number: 5431781
    Abstract: Process for the delignification of a chemical paper pulp by means of an organic peroxy acid, according to which the raw pulp arising from the cooking operation is treated with an aqueous solution of this organic peroxy acid, whose hydrogen peroxide content does not exceed 20% of the weight of the peroxy acid.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: July 11, 1995
    Assignee: Interox America
    Inventor: Patricia B. Walsh
  • Process for the colour stripping and bleaching of coloured waste paper
    Patent number: 5266158
    Abstract: Process for color stripping and bleaching of colored waste paper by treatment by means of monoperoxysulphuric acid or of one of its salts, according to which the treatment is performed in the presence of a halide ion.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: November 30, 1993
    Assignee: Interox America
    Inventors: Roy T. Hill, Patricia B. Walsh