Patents by Inventor Tsoung-Yuan Yan

Tsoung-Yuan Yan 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).

  • Treatment of lube stock for improvement of oxidative stability
    Patent number: 3979279
    Abstract: A stabilized lubricating oil stock resistant to oxidation and sludge formation upon exposure to a highly oxidative environment is formed by contacting the lubricating oil stock with hydrogen in the presence of a catalyst of low acidity comprised of a platinum-group metal on a solid refractory inorganic oxide support.A benefit of the present treatment process is that a high sulfur lubricating oil stock can be converted hereby into a stock which can be formulated using an additive package not containing a zinc-based component.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: September 7, 1976
    Assignee: Mobil Oil Corporation
    Inventor: Tsoung-Yuan Yan
  • Production of lubricating oils
    Patent number: 3968023
    Abstract: Residual oils are upgraded to lube oil base stocks by a combination process involving deasphalting, solvent extraction and hydrocracking arranged to particularly promote the efficient production of lube oil products.
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: July 6, 1976
    Assignee: Mobil Oil Corporation
    Inventor: Tsoung-Yuan Yan
  • Process for removing hydrogen sulfide from contaminated gas
    Patent number: 3959452
    Abstract: The thiosulfate-containing purge stream generated in a Stretford-type process for purifying a hydrogen sulfide contaminated gas stream is treated with phosphoric or sulfuric acid and then with lime to recover vanadate salts, anthraquinone disulfonic acid salts, and alkali, for reuse in the process.
    Type: Grant
    Filed: May 15, 1975
    Date of Patent: May 25, 1976
    Assignee: Mobil Oil Corporation
    Inventors: Wilton F. Espenscheid, Tsoung-Yuan Yan