Patents by Inventor Ying-Chech Chiu

Ying-Chech 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).

  • Process for displacing oil using aqueous anionic surfactant systems containing aromatic ether polysulfonates
    Patent number: 3945437
    Abstract: The properties of an aqueous surfactant system for displacing oil within a permeable medium are improved by adding an aromatic ether polysulfonate to the system. This improves the tolerance of the system toward salts of monovalent and/or multivalent cations, and also causes emulsions formed between the oil and the oil-displacing system to be less viscous and less stable.
    Type: Grant
    Filed: March 26, 1975
    Date of Patent: March 23, 1976
    Assignee: Shell Oil Company
    Inventors: Ying-Chech Chiu, Harold J. Hill