Patents by Inventor Nathan D. Lee

Nathan D. Lee 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).

  • Purification of alkylated anthraquinones
    Patent number: 4544543
    Abstract: The invention is for a process for removing unalkylated anthraquinones from alkylated anthraquinone by forming a solution thereof, reducing the solution sufficiently so that at least part of the unalkylated anthraquinone is in the reduced form, and extracting the reduced solution in the absence of an oxidizing agent with an aqueous alkaline solution. The process is especially suited for removing anthraquinone from an alkylated anthraquinone for use in the manufacture of hydrogen peroxide by reducing and oxidizing a solution of the alkylated anthraquinone.
    Type: Grant
    Filed: April 25, 1983
    Date of Patent: October 1, 1985
    Assignee: FMC Corporation
    Inventors: Nathan D. Lee, Dalbir S. Sethi