Patents by Inventor Khe-Bing J. Kho

Khe-Bing J. Kho 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).

  • Polyol resin binder compositions and process
    Patent number: 4273700
    Abstract: A new and improved foundry aggregate binder system and composition is comprised of a mixture of polyols.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: June 16, 1981
    Assignee: Reichhold Chemicals, Incorporated
    Inventor: Khe-Bing J. Kho
  • Method, resin and catalyst for increasing the tensile strength and core hardness of a sand mold or core
    Patent number: 4220578
    Abstract: The tensile strength and core hardness of a sand mold or core is increased by incorporating into a mixture of a thermosetting acid-hardenable resin and sand, a dialkyl ester of the formula:R.sub.1 OOC(CH.sub.2).sub.n COOR.sub.2wherein R.sub.1 and R.sub.2, which may be the same or different, are selected from alkyl of 1 to 20 carbon atoms and n is 2, 3 or 4. The ester may be added directly to the resin or sand, or in conjunction with the acid catalyst. Ferric chloride together with the dialkyl ester provides a sulfur-free catalyst for polymerization of the resin.
    Type: Grant
    Filed: March 27, 1978
    Date of Patent: September 2, 1980
    Assignee: CL Industries Inc.
    Inventors: Khe-Bing J. Kho, Patrick H. Stewart
  • Catalyst for increasing the tensile strength and core hardness of a sand mold or core
    Patent number: 4215012
    Abstract: The tensile strength and core hardness of a sand mold or core is increased by incorporating into a mixture of a thermosetting acid-hardenable resin and sand, a dialkyl ester of the formula:R.sub.1 OOC(CH.sub.2).sub.n COOR.sub.2wherein R.sub.1 and R.sub.2, which may be the same or different, are selected from alkyl of 1 to 20 carbon atoms and n is 2, 3 or 4. The ester may be added directly to the resin or sand, or in conjunction with the acid catalyst. Ferric chloride together with the dialkyl ester provides a sulfur-free catalyst for polymerization of the resin.
    Type: Grant
    Filed: March 28, 1978
    Date of Patent: July 29, 1980
    Assignee: C L Industries, Inc.
    Inventors: Khe-Bing J. Kho, Patrick H. Stewart