Patents by Inventor Tom M. H. Cheng

Tom M. H. Cheng 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).

  • Treatment of effluents containing dioxane
    Patent number: 4405799
    Abstract: The invention relates to the treatment to remove dioxane from gaseous effluents by contacting the effluent with a concentrated acid having a pK.sub.1 value of not more than 5 to complex the dioxane with acid preliminary to venting the treated gaseous effluent to the atmosphere and disposing of the complex wherein the dioxane is concentrated.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: September 20, 1983
    Assignee: GAF Corporation
    Inventors: Paritosh M. Chakrabarti, Mohamed M. Hashem, Tom M. H. Cheng