Patents Examined by Walter D. Griffen
  • Patent number: 7682813
    Abstract: An organic solid waste digester for producing methane from solid waste, the digester comprising a reactor vessel for holding solid waste, a sprinkler system for distributing water, bacteria, and nutrients over and through the solid waste, and a drainage system for capturing leachate that is then recirculated through the sprinkler system.
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: March 23, 2010
    Assignee: Arrowhead Center, Inc.
    Inventors: Zohrab A. Samani, Adrian T. Hanson, Maritza Macias-Corral
  • Patent number: 6663768
    Abstract: An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which is at least 6° C. above a target pour point, over a select molecular sieve having specified pore properties. The isomerized oil is then solvent dewaxed to a very low pour point. This process produces a dewaxed lubricating oil base stock which has an exceptionally high viscosity index.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: December 16, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 5880322
    Abstract: A method for producing diarylalkanes at a high yield using an aromatic hydrocarbon and inexpensive formalin in the presence of an easily usable solid acid catalyst, and in the method, a mixture of an aromatic hydrocarbon and formalin, said mixture containing 1.5 to 12% by weight of water, is reacted at a temperature of 170 to 450.degree. C. under an elevated pressure in the presence of a zeolitic catalyst.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: March 9, 1999
    Assignee: Nippen Petrochemicals Company, Limited
    Inventors: Hideyuki Dohi, Syozo Hayashi
  • Patent number: 5558766
    Abstract: A tri-elemental catalyst on a support that includes a pentasil crystalline zeolite and is suitable for hydrocracking and hydrogenation of aromatics-containing petroleum hydrocarbon feedstocks such as hydrotreated cracked feedstock, virgin feedstock, vacuum distillate, middle distillate, mixtures thereof, and the like, is disclosed. The catalyst is suitable for hydrodesulfurization as well as hydrodenitrogenation, thus the feedstock can contain sulfur and nitrogen in addition to the aromatic components. Hydrocracking and aromatics hydrogenation of the petroleum hydrocarbon feedstocks is accomplished under a relatively wide range of process conditions in plural process zones using the tri-elemental catalyst that contains a catalytically active metal phase constituted by a Group VI-B element, a Group VIII first transition series element and a Group VIII second transition series element.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: September 24, 1996
    Assignee: Intevep, S.A.
    Inventors: Ricardo Prada, Robert T. Galiasso, Yilda Romero, Edito Reyes, Edilberto Rodriguez