Patents by Inventor Joe S. Trevino

Joe S. Trevino 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).

  • Color control & stability in acetaminophen
    Patent number: 5399760
    Abstract: A method is provided for purifying crude N-acetyl-para-aminophenol (APAP) containing color bodies or their precursors, the method comprising: a) forming a solution of the crude APAP; and b) subsequently contacting the solution with substoichiometric quantifies of an acetylating agent for a sufficient period of time to convert said color bodies or their precursors to substantially non-color bodies/stable, colorless substances; said quantities of acetylating agent provided is such that substantially none of the APAP is converted to other compounds.
    Type: Grant
    Filed: August 11, 1993
    Date of Patent: March 21, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Edward G. Zey, Olan S. Fruchey, Thomas H. Shockley, Joe S. Trevino, B. Frank Wood, Daniel D. Lindley