Patents by Inventor Kam H. Wong

Kam H. Wong 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 reducing discoloration of cellulosic fibers, treated at a high temperature with a solution of a polycarboxylic acid and boric acid or borate
    Patent number: 5199953
    Abstract: A process for reducing discoloration of fibrous cellulosic material, treated at temperatures above about 175.degree. C. with a treating solution of a polycarboxylic acid and a phosphate salt curing catalyst, comprises adding to the treating solution an inorganic boron-oxygen compound.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: April 6, 1993
    Assignee: Ortec, Inc.
    Inventors: Kwok-Wing Fung, Kam H. Wong, David L. Brotherton
  • Process for the oxidation of a tetrahydrophthalic acid
    Patent number: 5157152
    Abstract: A process for oxidation of a tetrahydro compound of the formula ##STR1## wherein R and R' independently are H, alkyl, aryl or halo, to a glycol of the formula ##STR2## comprises treating the tetrahydro compound with hydrogen peroxide at an elevated temperature under reflux conditions in the absence of a catalyst. The thus-formed glycol can be further oxidized to a butanetetracarboxylic acid of the formula ##STR3## with hydrogen peroxide in the presence of a catalyst selected from the group consisting of a manganese salt, an iron salt, a chromium salt, a cerium salt, a persulfate, a perborate, a silicate, tungstic acid or an ammonium or alkali metal salt or heteropolyacid thereof, or molybdic acid or an ammonium or alkali metal salt or heteropolyacid thereof.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: October 20, 1992
    Assignee: Ortec, Inc.
    Inventors: David L. Brotherton, Kwok W. Fung, Kam H. Wong