Patents by Inventor Sum-Muk Lee

Sum-Muk 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).

  • Process for preparing ethylenediaminetetraacetonitrile
    Patent number: 4704465
    Abstract: A process for preparing an ethylenediamine intermediate for the production of an ethylenediaminetetraacetonitrile. Formaldehyde is combined with ethylenediamine at a mole ratio of 1 to 2 respectively wherein the molar ratio of ethylenediamine to formaldehyde in the reaction mixture at least 0.48 or greater.
    Type: Grant
    Filed: November 22, 1985
    Date of Patent: November 3, 1987
    Assignee: Monsanto Company
    Inventors: Kent P. Lannert, Sum-Muk Lee