Patents by Inventor Richard J. Sheehan

Richard J. Sheehan 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).

  • Color stabilization of refined dicarboxylic acid anhydrides
    Patent number: 3975408
    Abstract: Refined dicarboxylic acid anhydrides such as maleic anhydride are provided with improved color stability by a treating agent selected from the group consisting of chlorine and halides or elements in group IVb of the periodic table, the transition elements, vanadium, chromium, manganese, mercury, silicon, phosphorus, bismuth, antimony, lead, cerium and sulfur.
    Type: Grant
    Filed: October 31, 1972
    Date of Patent: August 17, 1976
    Assignee: Monsanto Company
    Inventors: Ronald J. Boyer, Raymond E. Stenseth, Richard J. Sheehan