Patents by Inventor Wie-Hin Pan

Wie-Hin Pan 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).

  • Self-promoted molybdenum and tungsten sulfide hydrotreating catalysts from bis(tetrathiometallate) precursors
    Patent number: 4510260
    Abstract: Self-promoted molybdenum and tungsten sulfide hydrotreating catalyst are formed by heating one or more carbon-containing, bis(tetrathiometallate) catalyst precursor hydrogen with a supported, self-promoted catalyst salts selected from the group consisting of (NR.sub.4).sub.2 [M(WS.sub.4).sub.2 ], (NR.sub.4).sub.x [M(MoS.sub.4).sub.2 ] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is convalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe in a non-oxidizing atmosphere in the presence of sulfur hydrogen, and hydrocarbon.
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: April 9, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventors: Edward I. Stiefel, Wie-Hin Pan, Russell R. Chianelli