Patents by Inventor Ching-Shi Yang

Ching-Shi 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).

  • Production of chlorine dioxide
    Patent number: 4931268
    Abstract: Chlorine dioxide is generated at high efficiency from feeds of chlorate cell liquor, sulphuric acid and methanol by a hybrid of reaction of sodium chlorate with sulphuric acid and methanol and reaction of sodium chlorate with sulphuric acid and sodium chloride. The reaction medium is maintained at its boiling point under a subatmospheric pressure while sodium sesquisulphate precipitates from the reaction medium.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: June 5, 1990
    Assignee: Tenneco Canada Inc.
    Inventors: Maurice C. J. Fredette, Ching-Shi Yang
  • Production of chlorine dioxide
    Patent number: 4627969
    Abstract: Chlorine dioxide is generated at high efficiency from feeds of chlorate cell liquor, sulphuric acid and methanol by a hybrid of reaction of sodium chlorate with sulphuric acid and methanol and reaction of sodium chlorate with sulphuric acid and sodium chloride. The reaction medium is maintained at its boiling point under a subatmospheric pressure while sodium sesquisulphate precipitates from the reaction medium.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: December 9, 1986
    Assignee: Tenneco Canada Inc.
    Inventors: Maurice C. J. Fredette, Ching-Shi Yang