Patents by Inventor David Downs

David Downs 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).

  • Patent number: 9957439
    Abstract: Friction reducers for hydraulic fracturing fluids, hydraulic fracturing fluids containing the friction reducers, and methods of making and using same are disclosed. The friction reducers comprise ethylene oxide polymers, propylene oxide polymers, ethylene oxide-propylene oxide co-polymers, and combinations thereof, and can further comprise a dispersant, such as polypropylene glycol. The friction reducer formulations can be active across a wide range of brine salinities, and tolerant of high levels of divalent cations in solution. The friction reducers can have a cloud point temperature, above which temperature they can precipitate out of solution and deposit on a surface of a hydrocarbon-bearing formation to inhibit hydration of the shale formations lining the fractures.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: May 1, 2018
    Assignee: BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM
    Inventors: Eric van Oort, John David Downs
  • Publication number: 20160160118
    Abstract: Friction reducers for hydraulic fracturing fluids, hydraulic fracturing fluids containing the friction reducers, and methods of making and using same are disclosed. The friction reducers comprise ethylene oxide polymers, propylene oxide polymers, ethylene oxide-propylene oxide co-polymers, and combinations thereof, and can further comprise a dispersant, such as polypropylene glycol. The friction reducer formulations can be active across a wide range of brine salinities, and tolerant of high levels of divalent cations in solution. The friction reducers can have a cloud point temperature, above which temperature they can precipitate out of solution and deposit on a surface of a hydrocarbon-bearing formation to inhibit hydration of the shale formations lining the fractures.
    Type: Application
    Filed: December 4, 2015
    Publication date: June 9, 2016
    Inventors: Eric van Oort, John David Downs
  • Patent number: 9034395
    Abstract: Processes for preparing extracts of natural products such as plant material, and for preparing purified extracts from crude extracts of natural products, by extraction with hot gas. Apparatus suitable for use in preparing extracts of natural products are also described.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: May 19, 2015
    Assignee: GW Pharma Limited
    Inventors: Brian Whittle, Geoffrey Guy, David Downs, David W. Pate
  • Publication number: 20100119606
    Abstract: Processes for preparing extracts of natural products such as plant material, and for preparing purified extracts from crude extracts of natural products, by extraction with hot gas. Apparatus suitable for use in preparing extracts of natural products are also described.
    Type: Application
    Filed: November 13, 2009
    Publication date: May 13, 2010
    Applicant: GW Pharma Limited
    Inventors: Brian Whittle, Geoffrey Guy, David Downs, David W. Pate
  • Patent number: 7622140
    Abstract: Processes for preparing extracts of natural products such as plant material, and for preparing purified extracts from crude extracts of natural products, by extraction with hot gas. Apparatus suitable for use in preparing extracts of natural products are also described.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: November 24, 2009
    Assignee: GW Pharma Limited
    Inventors: Brian Whittle, Geoffrey Guy, David Downs, David Pate
  • Patent number: 7088914
    Abstract: A device for vaporizing a medicament (4). The device comprises a resistive element (9) on which the medicament is deposited. The device also comprises a source of electrical power which can be connected across the resistive element to vaporize the medicament. The element is configured to provide a central cool region (11) on which the medicament is deposited and a relatively hotter region (12) surrounding the cool region. Through holes (13) are also provided. The resistive element may be a mesh, foil or a tile on which a resistive pattern is deposited.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: August 8, 2006
    Assignees: GW Pharma Limited, Tyco Electronics UK Limited
    Inventors: Brian Anthony Whittle, John Erwin Richard Bowyer, Anthony Hamish Harper, Anthony Vanhinsberg, Christopher Robert Melbourne, David Downs, Rajiv Bobby Dave
  • Publication number: 20050063686
    Abstract: A device for vaporising a medicament (4). The device comprises a resistive element (9) on which the medicament is deposited. The device also comprises a source of electrical power which can be connected across the resistive element to vaporise the medicament. The element is configured to provide a central cool region (11) on which the medicament is deposited and a relatively hotter region (12) surrounding the cool region. Through holes (13) are also provided. The resistive element may be a mesh, foil or a tile on which a resistive pattern is deposited.
    Type: Application
    Filed: October 31, 2002
    Publication date: March 24, 2005
    Inventors: Brian Whittle, John Bowyer, Anthony Harper, Anthony Vanhinsberg, Christopher Melbourne, David Downs, Rajiv Dave
  • Publication number: 20040147767
    Abstract: Processes for preparing extracts of natural products such as plant material, and for preparing purified extracts from crude extracts of natural products, by extraction with hot gas. Apparatus suitable for use in preparing extracts of natural products are also described.
    Type: Application
    Filed: November 4, 2003
    Publication date: July 29, 2004
    Inventors: Brian Whittle, Geoffrey Guy, David Downs
  • Publication number: 20040026002
    Abstract: A method of making a gypsum board includes mixing together gypsum and water in a mixer to form a gypsum slurry; discharging the gypsum slurry onto a first facing sheet; laying a second facing sheet on top of the discharged gypsum slurry; passing the gypsum slurry and facing sheets through a forming station to form the slurry to a desired thickness; allowing the formed gypsum slurry to set; removing at least one of the facing sheets from the set gypsum; cutting the set gypsum into boards; and drying the cut gypsum boards.
    Type: Application
    Filed: February 5, 2003
    Publication date: February 12, 2004
    Inventors: Walter Weldon, Steven Roy Butler, David Downs
  • Patent number: 5232934
    Abstract: A method of treatment is provided for reducing or eliminating psychomotor addiction in mammalian subjects, employing as an active agent 3-phenoxypyridine or a pharmaceutically acceptable acid-addition salt thereof.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: August 3, 1993
    Assignee: Warner-Lambert Co.
    Inventor: David Downs