Patents by Inventor Walter J. Cordes

Walter J. Cordes 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 the preparation of methyl carbamates and thioimidates
    Patent number: 4698438
    Abstract: A continuous, close-coupled method for making N-methyl carbamate pesticides which comprises contacting the methyl isocyanate in a vapor phase mixture containing methyl isocyanate and water with a selected oxime or phenol, said mixture being the reaction product formed by oxidizing monomethylformamide. An optional intermediate step for preparing the methyl isocyanate/water vapor phase reaction mixture for contact with the oxime or phenol is to remove therefrom a portion of the water without liquefying the methyl isocyanate by cooling the mixture to a temperature below the dew point of water but above the dew point of the methyl isocyanate.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: October 6, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Charles T. Blaisdell, Walter J. Cordes, George E. Heinsohn, John F. Kook, John R. Kosak