Patents by Inventor Douglas T. Walker

Douglas T. Walker 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).

  • Methods for removing substances from aqueous solutions
    Patent number: 5045214
    Abstract: Methods are provided for removing contaminants from an aqueous solution to yield a less contaminated aqueous effluent. In one embodiment of the invention, the method comprises coprecipitating non-volatile contaminants (i.e., heavy metals, light metals, cyanide, phenolics, oil and grease, TSS, BOD, COD, and/or TOC) with a carrier precipitate which is formed in situ within the aqueous solution. In another embodiment of the invention, the method comprises partitioning volatile organic contaminants between a liquid phase and a gas phase. In yet a further embodiment, the above versions of the invention are simultaneously performed in the same reaction vessel.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: September 3, 1991
    Assignee: Union Oil Company of California
    Inventor: Douglas T. Walker
  • Method for removing heavy metals from aqueous solutions by coprecipitation
    Patent number: 5013453
    Abstract: A method is provided for removing heavy metal ions from an aqueous solution to yield a less contaminated aqueous effluent. The method comprises coprecipitating the heavy metal ions with a carrier precipitate which is formed in situ within the aqueous solution.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: May 7, 1991
    Assignee: Union Oil Company of California
    Inventor: Douglas T. Walker