Patents by Inventor Chris C. Chao

Chris C. Chao 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).

  • Removal of titanium dioxide from a filter element
    Patent number: 4292090
    Abstract: Titanium dioxide is removed from contaminated workpieces by immersing them in an alkaline solution containing calcium ions at approximately 30.degree. C. The cleaning solution is made from a concentrated aqueous alkaline hydroxide solution and a calcium salt or from a basic calcium salt, e.g., calcium oxide.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: September 29, 1981
    Assignee: Textron Inc.
    Inventor: Chris C. Chao