Patents by Inventor Yumi P. Ryu

Yumi P. Ryu 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).

  • Lubricating oils containing quaternary ammonium thiomolybdates
    Patent number: 4400282
    Abstract: Hydrocarbon lubricating oils with a tetrahydrocarbylammonium thiomolybdate having at least about 19 carbon atoms, such as dicocodimethylammonium thiomolybdate, solubilized in the oil are characterized by improved anti-friction properties.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: August 23, 1983
    Assignee: Gulf Research & Development Company
    Inventors: Gary M. Singerman, Yumi P. Ryu, James R. Anglin
  • Lubricating oils containing molybdenyl chelates
    Patent number: 4383931
    Abstract: The antifriction properties of a lubricating oil are enhanced by the addition of a minor amount of an oil-soluble molybdenyl bis-.beta.-diketonate. The antifriction properties are particularly enhanced when the molybdenyl bis-.beta.-diketonate is used in combination with an oil-soluble active sulfur donor, such as a zinc dialkyldithiophosphate.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: May 17, 1983
    Assignee: Gulf Research & Development Company
    Inventors: Yumi P. Ryu, Robert J. Hartle
  • Grease compositions containing quaternary ammonium thiomolybdates
    Patent number: 4370245
    Abstract: The presence of a minor amount of a tetrahydrocarbylammonium thiomolybdate containing at least about 15 carbon atoms, such as trioctylmethylammonium thiomolybdate, to a grease thickened with a substituted-urea composition substantially improves the extreme pressure properties of the grease.
    Type: Grant
    Filed: December 24, 1980
    Date of Patent: January 25, 1983
    Assignee: Gulf Research & Development Company
    Inventors: Yumi P. Ryu, James R. Anglin, Gary M. Singerman
  • Quaternary ammonium thiomolybdates
    Patent number: 4343746
    Abstract: Novel quaternary ammonium thiomolybdates are prepared by contacting an aqueous solution of a thiomolybdate salt with a solution of a water-insoluble quaternary ammonium salt in a water-immiscible organic solvent. For example, mixing a solution of dicocodimethylammonium chloride in toluene with an aqueous solution of potassium thiomolybdate results in a toluene solution containing dicocodimethylammonium thiomolybdate. These quaternary ammonium thiomolybdates find use as additives in motor oils and greases to enhance their antifriction characteristics.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: August 10, 1982
    Assignee: Gulf Research & Development Company
    Inventors: James R. Anglin, Yumi P. Ryu, Gary M. Singerman
  • Preparation of quaternary ammonium thiomolybdates
    Patent number: 4343747
    Abstract: Quaternary ammonium thiomolybdates are prepared in a two-phase reaction system by contacting an aqueous solution of a thiomolybdate salt with a solution of a quaternary ammonium salt in a water-immiscible organic solvent. For example, mixing a solution of dicocodimethylammonium chloride in toluene with an aqueous solution of potassium thiomolybdate results in a toluene solution containing dicocodimethylammonium thiomolybdate.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: August 10, 1982
    Assignee: Gulf Research & Development Company
    Inventors: Yumi P. Ryu, Gary M. Singerman, James R. Anglin