Patents by Inventor Walter David Vann

Walter David Vann 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).

  • Alkali metal hydroprocessing of heavy oils with enhanced removal of coke products
    Patent number: 8894845
    Abstract: Hydrocarbon feedstreams are desulfurized using an alkali metal reagent, optionally in the presence of hydrogen. Improved control over reaction conditions can be achieved in part by controlling the particle size of the alkali metal salt and by using multiple desulfurization reactors. The processes herein allow a simple and effective method for removing the majority of coke formed in the alkali metal reagent reactions with the hydrocarbon feedstreams. This makes it cost effective to run such processes at higher severities (which result in higher coke production) thereby resulting in increased amounts of valuable converted hydrocarbon product yields. The process improvements herein may also be used to increase total throughput through a unit due to the ability to effectively manage higher coke content in the reaction products.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: November 25, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Walter David Vann, Daniel Paul Leta, Jonathan Martin McConnachie, Richard Alan Demmin, Douglas Wayne Hissong, William C. Baird, Jr., Roby Bearden, Jr., James Ronald Bielenberg, Howard Freund, Chris Aaron Wright, Michael Francis Raterman, James Ronald Rigby, Brandon Thomas Stone
  • HVI-PAO in industrial lubricant and grease compositions
    Patent number: 8399390
    Abstract: The invention relates to industrial lubricant and grease compositions containing high viscosity index polyalphaolefins (HVI-PAO). The use of HVI-PAOs in industrial oils and greases application provides advantages in improved shear stability, wear property, foam property, energy efficiency and improved overall performance.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: March 19, 2013
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Margaret May-Som Wu, Andrew Jackson, Walter David Vann, James Thomas Carey, Norman Yang, Suzzy Chen Hsi Ho
  • Method for analysis of a working fluid using impedance spectroscopy
    Patent number: 7109729
    Abstract: An on-line method for determining the condition of low conductivity working fluids using alternating current, electro-impedance spectroscopy is provided by making measurements over a range of frequencies at temperatures at or above 50° C.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: September 19, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Alan Mark Schilowitz, Monica M. Lira-Cantu, Limin Song, Walter David Vann
  • Synthetic hydrocarbon fluid
    Patent number: 6872692
    Abstract: A synthetic lubricant base stock is provided having a kinematic viscosity at 100° C. of from 5 to about 300 cS and a VI greater than 100. The base stock comprises random co-oligomers of an alpha olefin or mixtures thereof and an olefinic substituted aromatic compound which co-oligomers are prepared in the presence of a Friedel-Crafts catalyst.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: March 29, 2005
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Margaret May-Som Wu, Steven Edward Donnachie, James Thomas Carey, Walter David Vann, Norman Yang, Dilip Surana
  • Method for analysis of a working fluid using impedance spectroscopy
    Publication number: 20040085080
    Abstract: An on-line method for determining the condition of low conductivity working fluids using alternating current, electro-impedance spectroscopy is provided by making measurements over a range of frequencies at temperatures at or above 50° C.
    Type: Application
    Filed: May 15, 2003
    Publication date: May 6, 2004
    Inventors: Alan Mark Schilowitz, Monica M. Lira-Cantu, Limin Song, Walter David Vann
  • Synthetic hydrocarbon fluid
    Publication number: 20030114320
    Abstract: A synthetic lubricant base stock is provided hang a kinematic viscosity at 100° C. of from 5 to about 300 cS and a VI greater than 100. The base stock comprises random co-oligomers of an alpha olefin or mixtures thereof and an olefinic substituted aromatic compound which co-oligomers are prepared in the presence of a Friedel-Crafts catalyst.
    Type: Application
    Filed: September 10, 2002
    Publication date: June 19, 2003
    Inventors: Margaret May-Som Wu, Steven Edward Donnachie, James Thomas Carey, Walter David Vann, Norman Yang, Dilip Surana