Patents by Inventor Chau-Hwa Yang

Chau-Hwa Yang 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: 5013764
    Abstract: A catalyst and method are provided for preparing a mixture of lower aliphatic alcohols by reacting a mixture of carbon monoxide and hydrogen under suitable conditions of temperature and pressure in the presence of a catalyst composition comprising palladium, an alkali metal or a mixture of alkali metals and a molybdenum promoter.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: May 7, 1991
    Assignee: Texaco Inc.
    Inventors: Jeffrey B. Harrison, Chau-Hwa Yang
  • Patent number: 4914072
    Abstract: This invention relates to a method for the preparation of predominantly linear polyethylenepolyamines by reacting ethylenediamine with monoethanolamine in the presence of a phosphorus/titania/zirconia catalyst.The catalysts that are used in accordance with the present invention are composed of phosphorus, titania and zirconia. They are prepared by mixing solutions of a tetravalent compound of titanium with a tetravalent compound of zirconium, treating the solution to simultaneously heterogeneously coprecipitate titania and zirconia to form a heterogeneous titania/zirconia support, recovering the coprecipitate, treating it with a compound of phosphorus to bond from about 0.5 to 6 wt. % of phosphorus to the coprecipitate and then stabilizing the resultant catalyst by calcining it at about 200.degree. to about 800.degree. C.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: April 3, 1990
    Assignee: Texaco Inc.
    Inventors: Neal J. Grice, John F. Knifton, Chau-Hwa Yang