Patents by Inventor Christopher Soundang Liu

Christopher Soundang Liu 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).

  • Polyisobutylene succinimide and ethylene-propylene succinimide synergistic additives for lubricating oils compositions
    Patent number: 6117825
    Abstract: A lubricating oil composition comprising:(a) a major amount of an oil of lubricating viscosity; and(b) a minor dispersant amount of a synergistic combination of an antioxidant-dispersant additive and a dispersant additive, said combination comprising:(i) a polyisobutylene succinimide; and(ii) an ethylene-propylene succinimide.
    Type: Grant
    Filed: May 7, 1992
    Date of Patent: September 12, 2000
    Assignee: Ethyl Corporation
    Inventors: Christopher Soundang Liu, Cyril Andrew Migdal, Norris Roland Crawford, Roy Isamu Yamamota