Patents by Inventor Roy T. Hill

Roy T. Hill 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 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