Patents by Inventor Larry O. Wheeler

Larry O. Wheeler 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).

  • Patent number: 6277783
    Abstract: A method is provided for purifying a crude N-acetyl-para-aminophenol (APAP) containing color bodies or their precursors, the method comprising: a) forming a hot aqueous solution of the crude APAP; and b) subsequently contacting the hot solution with an acid washed adsorbent carbon, e.g., an activated carbon, which acid washed carbon, prior to such contact, has been pretreated by contacting it with an aqueous solution of a reducing sulfite.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: August 21, 2001
    Assignee: BASF Corporation
    Inventors: Olan Stanley Fruchey, Edward G. Zey, Larry O. Wheeler
  • Patent number: 5981799
    Abstract: A method is provided for purifying a crude N-acetyl-para-aminophenol (APAP) containing color bodies or their precursors, the method comprising: a) forming a hot aqueous solution of the crude APAP; and b) subsequently contacting the hot solution with an acid washed adsorbent carbon, e.g., an activated carbon, which acid washed carbon, prior to such contact, has been pretreated by contacting it with an aqueous solution of a reducing sulfite.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: November 9, 1999
    Assignee: BASF Corporation
    Inventors: Olan Stanley Fruchey, Edward G. Zey, Larry O. Wheeler
  • Patent number: 5271811
    Abstract: 2-(4-Isobutylphenyl)-propionic acid is purified by subjecting it to a vacuum rectification, in which the temperature is below the decomposition temperature of the acid.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: December 21, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Siegbert Rittner, Adolf Schmidt, Larry O. Wheeler, Gary L. Moss, Edward G. Zey