Patents by Inventor Darrell A. Fisher

Darrell A. Fisher 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).

  • Rhodium/inorganic iodide catalyst system for methanol carbonylation process with improved impurity profile
    Patent number: 6323364
    Abstract: The method of the present invention provides an improvement upon prior art methanol carbonylation methods which substantially reduces the production of carbonyl impurities. The production of carbonyl impurities, particularly acetaldehyde, crotonaldehyde, and 2-ethyl crotonaldehyde, in methanol carbonylation reactions has been found to decrease by maintaining less than about 4.5 wt % methyl iodide in the reaction medium during the course of the reaction.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: November 27, 2001
    Assignee: Celanese International Corporation
    Inventors: Pramod Agrawal, Hung-Cheun Cheung, Darrell A. Fisher, Valerie Santillan, Mark O. Scates, Elaine C. Sibrel, G. Paul Torrence