Patents by Inventor Richard William Fengl

Richard William Fengl 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 co-production of dissolving-grade pulp and xylan
    Patent number: 6057438
    Abstract: Disclosed is a process for upgrading paper-grade wood pulp to dissolving grade pulp which is suitable for use in the preparation of viscose rayon, cellulose ethers and cellulose esters such as cellulose acetate. The process utilizes a sequence of caustic extraction, xylanase treatment and caustic extraction to remove most of the xylan, which may be recovered for use in the production of xylose, xylitol, and furans.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: May 2, 2000
    Assignee: Eastman Chemical Company
    Inventors: John Anthony Hyatt, Richard William Fengl, Kevin Joseph Edgar, Maria Teresa Alvarez-Wright