Patents by Inventor Jeffrey H.-G. Yen

Jeffrey H.-G. Yen 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).

  • Hot lime precipitation of arsenic from wastewater or groundwater
    Patent number: 5378366
    Abstract: A process is disclosed wherein arsenic dissolved in wastewater or groundwater is removed from solution by precipitation thereof as calcium arsenate formed by the reaction of the arsenic with lime or hydrated lime in a heated solution at a pH of about 11 to about 13. It is preferred that the arsenic is first converted by oxidation to its pentavalent form.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: January 3, 1995
    Assignee: Elf Atochem North America, Inc.
    Inventor: Jeffrey H.-G. Yen
  • Process for removing sulfur from organic sulfides
    Patent number: 5312992
    Abstract: A process for removing sulfur from an organic sulfide containing three or more chemically bound sulfur atoms is disclosed wherein said sulfide is contacted with a defined catalyst at elevated temperature to increase the disproportionation rate and the corresponding sulfide of lower sulfur rank is continuously removed from the reaction zone.
    Type: Grant
    Filed: October 23, 1991
    Date of Patent: May 17, 1994
    Assignee: Elf Atochem North America, Inc.
    Inventors: Roger T. Clark, Michael J. Lindstrom, Glenn T. Carroll, Jeffrey H.-G. Yen