Patents by Inventor Edmund M. Choy

Edmund M. Choy 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).

  • Foaming agent
    Patent number: 4548649
    Abstract: A foaming agent for use in the preparation of foam compositions for surface sizing paper or the like comprises the synergistic combination of a C.sub.21 dicarboxylic acid (DIACID 1550) and an alkylarylsulfonate soap (Na-DDBS).
    Type: Grant
    Filed: November 23, 1983
    Date of Patent: October 22, 1985
    Assignee: Westvaco Corporation
    Inventors: Edmund M. Choy, Mark E. Baran
  • Internal sizing with black liquid
    Patent number: 4517052
    Abstract: A portion of the spent cooking liquor from a pulping process is diverted from the washing step directly to the machine chest of a paper machine for pre-sizing the paper made on the paper machine. The preferred pulping process is an unbleached kraft or sulfate process and the preferred raw material for the pulping process is pine or softwood chips. Moreover, the preferred point in the washing step for diverting the black liquor is near or at the final washing stage.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: May 14, 1985
    Assignee: Westvaco Corporation
    Inventor: Edmund M. Choy