Patents by Inventor Yu-Chia T. Chou

Yu-Chia T. Chou 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).

  • Alkaline extraction, peroxide bleaching of nonwoody lignocellulosic substrates
    Patent number: 4957599
    Abstract: An improved process for delignifying and bleaching nonwoody, lignocellulosic material into products digestible by ruminants and ingestible by humans. The process comprises treating the substrate in an alkaline solution for a period of time, separating the wetted substrate from the slurry and then treating the wetted substrate with an alkaline peroxide solution at an initial pH of 8.5 to 11.0 for a period of time, and separating, washing and drying the product.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: September 18, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Yu-Chia T. Chou, David F. Garrison, William I. Lewis
  • Acid purification of product from alkaline peroxide processing of nonwoody lignocellulosic substrates
    Patent number: 4859282
    Abstract: An improved process of purifying the product from an alkaline peroxide treatment process for delignifying and bleaching nonwoody lignocellulosic agricultural residues comprising, optionally washing with water, then lowering and maintaining the pH of the substrate at less than about pH 3.0, then washing sufficiently to remove residual chemicals, separating the product from the wash liquid and, optionally, drying the product.
    Type: Grant
    Filed: April 15, 1988
    Date of Patent: August 22, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Yu-Chia T. Chou, David F. Garrison, William I. Lewis
  • Supercritical ammonia treatment of lignocellulosic materials
    Patent number: 4644060
    Abstract: The bioavailability of polysaccharide components of lignocellulosic materials can be increased substantially by treatment with ammonia in a supercritical or near-supercritical fluid state.
    Type: Grant
    Filed: May 21, 1985
    Date of Patent: February 17, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Yu-Chia T. Chou
  • Process for separation of ethylene glycol and propylene glycol on selected zeolites
    Patent number: 4588847
    Abstract: A process for liquid-phase separation of ethylene glycol from mixtures containing propylene glycol by selective adsorption on at least one aluminosilicate zeolite selected from the group consisting of X zeolite, Y zeolite, and A zeolite is disclosed.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: May 13, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Yu-Chia T. Chou