Patents by Inventor Dong M. Chay

Dong M. Chay 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).

  • Surfactant foams and their use
    Patent number: 4284601
    Abstract: Aqueous foam compositions comprising water and a mixture of ammonium lauryl sulfate, methyl polyoxyethylene cocoamine chloride, dimethyl cocoamine oxide and polyvinyl alcohol are used to suppress the formation of fumes from fumable materials by covering the material with said compositions in the form of foam, thereby causing the material to react with the water to prevent fume release.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: August 18, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dong M. Chay, David J. Haack
  • Process for reacting liquids with solids
    Patent number: 4191736
    Abstract: The foaming tendencies of continuous liquid-solid reactions which evolve gas are reduced by subjecting the reactant stream simultaneously to non-turbulent flow through an enclosed conduit having a vapor space above the flowing stream and to mild agitation to increase the liquid-solid and gas-liquid interface areas.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: March 4, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Dong M. Chay