Patents by Inventor Steven E. Wentzek

Steven E. Wentzek 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).

  • Isolation of high purity diamondoid fractions and components
    Patent number: 5414189
    Abstract: A process is disclosed for separating high purity diamondoid fractions from a mixture containing substituted and unsubstituted diamondoid compounds.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: May 9, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Catherine S. H. Chen, Steven E. Wentzek
  • Oxidatively stable esters derived from diamondoids totally hydroxylated at the bridgeheads
    Patent number: 5397488
    Abstract: The invention provides a composition comprising Formula I as shown below and at least one selected from the group consisting of Formulae II, III, IV, and V as shown below: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are the same or different, and comprise alkyl groups containing no tertiary carbon and having from about 4 to about 15 carbon atoms. The composition of the invention is useful as a lubricant stock. A method for synthesizing the composition is also disclosed.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: March 14, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Catherine S. H. Chen, Suzanne E. Schramm, Steven E. Wentzek
  • Diamondoid-containing amines
    Patent number: 5380947
    Abstract: The invention provides a composition of matter selected from the group consisting of ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are selected from the group consisting of hydrogen and alkyl substituent groups having from 1 to about 8 carbon atoms, n is from 2 to about 20, m is from 2 to about 20, and Di is a substituted or unsubstituted diamondoid compound. The invention further provides diamondoid-containing ammonium salts, and a pharmaceutical treatment method using the compositions of the invention.
    Type: Grant
    Filed: June 4, 1993
    Date of Patent: January 10, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Catherine S. H. Chen, Dong-Ming Shen, Steven E. Wentzek
  • Method for synthesizing microporous crystalline material
    Patent number: 5256391
    Abstract: The invention provides a method for synthesizing a porous inorganic solid comprising the steps of: (a) forming a reaction mixture containing water, an alumina source, a silica source, an alkali metal oxide source, and a diquaternary ammonium salt having the formula: ##STR1## wherein R is a diamondoid group, n is from about 1 to about 50, and X is an anion which is not detrimental to the formation of said porous inorganic solid; and(b) recovering a porous inorganic solid from said reaction mixture.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: October 26, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Catherine S. H. Chen, John L. Schlenker, Steven E. Wentzek
  • Diamondoid recovery from natural gas fields
    Patent number: 5120899
    Abstract: A process is disclosed for separating diamondoid compounds from a natural gas stream containing the same comprising the steps of contacting the natural gas stream with a selected solvent and fractionating the sorbed diamondoids from the diamondoid-enriched solvent in a vacuum separation stage in the absence of reflux. Polyalphaolefin solvents are preferred, and polyalphaolefin solvents enriched in C.sub.30 oligomers are more preferred.
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: June 9, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Catherine S. H. Chen, Steven E. Wentzek