Patents by Inventor Su-Terng Chang

Su-Terng Chang 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).

  • Semi-synthetic two-stroke engine oil formulation
    Patent number: 5498353
    Abstract: A semi-synthetic two-stroke engine oil formulation which comprises a base oil consisting of a high-viscosity mineral oil, a medium-viscosity mineral oil, a solvent and a mixture of three polyisobutylenes with different molecular weights, and appropriate detergents and dispersants. This semi-synthetic two-stroke engine has both high lubricity and high detergency, and also meets the requirements of low smoke and low exhaust system blocking.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: March 12, 1996
    Assignee: Chinese Petroleum Corp.
    Inventors: Ron-Sheng Lin, Chen-Yi Lin, Tsae-Shycm Lee, Chi-Chung Chen, Su-Terng Chang, Kuo-Min Wei