Patents by Inventor Michael L. Chappell

Michael L. Chappell 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 purifying propylene oxide
    Patent number: 5248794
    Abstract: A process for purifying propylene oxide containing an unacceptable quantity of a poly(propylene oxide) polymer contaminant having a molecular weight of at least about 50,000, comprising the step of filtering propylene oxide containing such polymer contaminant through one or more membranes to provide a propylene oxide product fraction having an acceptable quantity of poly(propylene oxide) polymer contaminant therein and a second fraction which is more highly concentrated in such polymer contaminant.
    Type: Grant
    Filed: February 16, 1993
    Date of Patent: September 28, 1993
    Assignee: The Dow Chemical Company
    Inventors: Michael L. Chappell, Cameron T. Costain