Patents by Inventor Yungnien J. Chou

Yungnien J. Chou 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).

  • Method for preparing polyacetals and polyketals by emulsion polymerization
    Patent number: 4374953
    Abstract: Polyacetals and polyketals are prepared by reacting emulsified carbonyl compounds with emulsified polyfunctional alcohols in aqueous media and in the presence of specified polycondensation catalysts. Coherent films of the resultant polymers can be applied to substrates from aqueous or non-aqueous media.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: February 22, 1983
    Assignee: Dow Corning Corporation
    Inventors: Yungnien J. Chou, John C. Saam
  • Method for preparing condensation polymers by emulsion polymerization
    Patent number: 4355154
    Abstract: Polyesters are prepared by reacting aqueous compositions containing an emulsified hydroxyacid or an emulsified mixture comprising a polyfunctional carboxylic acid or anhydride and a polyfunctional alcohol. The emulsion also contains a suitable polycondensation catalyst. The resultant polyesters are useful as plasticizers and as precursors for alkyd resins and other polymers.
    Type: Grant
    Filed: October 6, 1981
    Date of Patent: October 19, 1982
    Assignee: Dow Corning Corporation
    Inventors: John C. Saam, Yungnien J. Chou