Patents Assigned to DVO, Inc.
  • Patent number: 10731190
    Abstract: The invention relates to composite components and methods of producing composite components. In yet another embodiment, the present invention relates to a method of producing a composite component using anaerobically digested biomass. In still yet another embodiment, the method further comprises using liquid effluent from the digester. In still yet another embodiment, the method further comprises wet-mat forming and cold pressing the anaerobically digested biomass and wet-mat drying under heat and pressure.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: August 4, 2020
    Assignees: DVO. Inc., The United States of America as Represented by the Secretary of Agriculture
    Inventors: Stephen W. Dvorak, John F. Hunt
  • Patent number: 10556804
    Abstract: Methods, systems, and apparatuses for anaerobic digestion of waste fibrous material and the recovery of nutrients are provided. Methods, systems, and apparatuses disclosed herein provide mechanisms to release dissolved gases from anaerobic digester effluent. Methods, systems and apparatuses disclosed herein can recover one or more nutrients from anaerobic digested effluent using a range of temperatures, aeration rates, aeration times, pH ranges, and settling times.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: February 11, 2020
    Assignees: DVO, INC., WASHINGTON STATE UNIVERSITY, ANDGAR CORPORATION
    Inventors: Quanbao Zhao, Stephen W. Dvorak, Shulin Chen, Craig Frear, Bryan J. VanLoo
  • Patent number: 9339760
    Abstract: Methods, systems and apparatuses herein provide a unique and novel process to remove H2S from biogas. Methods, systems and apparatuses herein provide a unique and novel process to remove H2S from biogas with ease of operation and reduced operating and capital costs. Methods, systems and apparatuses herein provide a unique and novel process to remove H2S over CO2 from biogas.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 17, 2016
    Assignees: DVO, Inc., Washington State University
    Inventors: Nicholas Kennedy, Quan-Bao Zhao, Anping Jiang, Craig Frear, Stephen W. Dvorak
  • Patent number: 9005918
    Abstract: The present disclosure provides an algae bioreactor and process. The algae bioreactor includes a container with an inlet and an outlet. An algae suspension present in the container interior moves from an inlet to an outlet along a flowpath. A light assembly, a liftwall, and a gas conduit are located in the container interior. The gas conduit extends along a length of the container and emits gas bubbles into the algae suspension. A diffuser is located on a bottom wall of the container, The flowpath, the liftwall, the gas conduit, and the diffuser produce an active flow of the algae from the container inlet to the container outlet. The container may be a deep-vessel container.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: April 14, 2015
    Assignee: DVO, Inc.
    Inventors: Stephen W. Dvorak, Douglas Van Ornum
  • Patent number: 8613894
    Abstract: Methods, systems, and apparatuses for anaerobic digestion of waste fibrous material and the recovery of nutrients are provided. Methods, systems, and apparatuses disclosed herein provide mechanisms to release dissolved gases from anaerobic digester effluent. Methods, systems and apparatuses disclosed herein can recover one or more nutrients from anaerobic digested effluent using a range of temperatures, aeration rates, aeration times, pH ranges, and settling times.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: December 24, 2013
    Assignees: DVO, Inc., Washington State University, Andgar Corporation
    Inventors: Quanbao Zhao, Stephen W. Dvorak, Shulin Chen, Craig Frear, Bryan J. VanLoo
  • Patent number: 8414808
    Abstract: The invention relates to composite components and methods of producing composite components. In yet another embodiment, the present invention relates to a method of producing a composite component using anaerobically digested biomass. In still yet another embodiment, the method further comprises using liquid effluent from the digester. In still yet another embodiment, the method further comprises wet-mat forming and cold pressing the anaerobically digested biomass and wet-mat drying under heat and pressure.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: April 9, 2013
    Assignees: DVO. Inc., The United States of America as Represented by the Secretary of Agriculture
    Inventors: Stephen W. Dvorak, John F. Hunt
  • Patent number: 8394271
    Abstract: A method and apparatus for the anaerobic digestion of high-solids waste material. The apparatus includes a closed container having a relatively circular outer wall. The closed container has a first passage having an inlet in which the waste material flows in a first direction, a second passage in which the waste material flows in a second direction, and a divider having an end. The divider separates the first passage from the second passage, such that the waste material flows around the end of the divider when flowing from the first passage to the second passage.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: March 12, 2013
    Assignee: DVO, Inc.
    Inventor: Stephen W. Dvorak
  • Publication number: 20120329139
    Abstract: The invention relates to methods and apparatuses for producing Class A biosolids. In yet another embodiment, the invention relates to a method comprising digesting waste material by anaerobic digestion, and yielding Class A biosolids. In still yet another embodiment, the invention relates to a system for anaerobic digestion of waste material to produce Class A biosolids. In still yet another embodiment, the invention relates to a system for anaerobic digestion of waste material comprising a mixing chamber, a digester, a heating pit, and an effluent pit.
    Type: Application
    Filed: November 24, 2010
    Publication date: December 27, 2012
    Applicant: DVO, INC.
    Inventor: Stephen W. Dvorak
  • Patent number: 8202721
    Abstract: A waste material processing system includes a closed container for holding waste material having a first passage in which the waste material flows in a first direction, the first passage having first and second ends, the first end including an inlet for waste material, a second passage in which the waste material flows in a direction opposite the first direction, the second passage having first and second ends, the second end including an outlet. The first passage is separated from the second passage by a divider, the second end of the first passage being adjacent the first end of the second passage, and the first end of the first passage being adjacent the second end of the second passage. A heating device is positioned in the first passage and/or the second passage to heat the waste material with a gas and to induce the waste material to move in a corkscrew-like fashion.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: June 19, 2012
    Assignee: DVO, Inc.
    Inventor: Stephen W. Dvorak