Patents by Inventor I-Ching Chiu

I-Ching Chiu 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).

  • Phosphorus-free antiwear/antifriction additives
    Patent number: 4863622
    Abstract: A phosphorous free antiwear/antifriction additive for lubricant oil is described. The additive is a fatty acid thio ester or a dialkyl disubstituted fatty acid thio amine having the formula of ##STR1## wherein R.sub.1 is a saturated or unsaturated hydrocarbon having 8 to 40 carbon atoms;R.sub.2, R.sub.3 and R.sub.4 are hydrocarbons having 1 to 4 carbon atoms; andn=1 to 4.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: September 5, 1989
    Assignee: Pennzoil Products Company
    Inventor: I.-Ching Chiu