Patents by Inventor Eddie J. Eckart

Eddie J. Eckart 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 preparation of a polyetherketone
    Patent number: 5258491
    Abstract: Disclosed is a process for removing the Lewis acid catalyst, polymerization solvent and byproducts, such as ketals, from a polyetherketone comprising(A) introducing into an extraction zone a Lewis acid polymerization catalyst, a polymerization solvent and a polyetherketone,(B) passing an alcohol through the extraction zone to remove a majority of the Lewis acid catalyst and the polymerization solvent,(C) passing water through the extraction zone to remove a majority of the alcohol,(D) contacting the polyetherketone with an aqueous acid solution,(E) passing water through the extraction zone to remove a majority of the acid,(F) passing steam through the extraction zone, and(G) subjecting the polyetherketone to a reduced pressure.
    Type: Grant
    Filed: September 4, 1992
    Date of Patent: November 2, 1993
    Assignee: Eastman Kodak Company
    Inventors: Victor H. Agreda, Eddie J. Eckart, Tim J. Frederick, J. Adrian Hawkins