Patents by Inventor Richard V. Pater

Richard V. Pater 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 alkyl 3-chlorosulfonylthiophene-2-carboxylate
    Patent number: H504
    Abstract: A process for preparation of chlorosulfonyl thiophene compounds comprising contacting a thiophenamine with sodium or potassium nitrite to produce a diazonium salt, then contacting said salt with sulfur dioxide and cuprous or cupric chloride, or bromide. Addition of gaseous HCl, concentrated H.sub.2 SO.sub.4, or oleum to the diazotization mixture enhances yield.
    Type: Grant
    Filed: March 7, 1985
    Date of Patent: August 2, 1988
    Assignee: E. I. Du Pont de Nemours
    Inventors: George Levitt, Richard V. Pater