Patents by Inventor John Crabtree

John Crabtree 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).

  • Publication number: 20100186966
    Abstract: An oil well includes a wellbore (2), below ground level (4), which extends to an oil reservoir (6). The wellbore includes a casing (8) within which is arranged a progressing cavity pump (PCP) 10 which includes an inlet (12) at its lower end and is connected at its upper end to production tube (14). An annulus (16) is defined between the pump (10)/tube (14) and the casing (8). The annulus communicates with the reservoir and includes a head (20) of reservoir fluid. A water based formulation which comprises an optionally cross-linked polyvinylalcohol can be poured down the annulus (16) and pass under gravity to the reservoir (6), immediately upstream of inlet (12). The formulation may improve the performance and efficiency of the pump (10) due to its ability to increase the mobility of the oil in the reservoir immediately upstream of the pump (10) and/or enhance the ability of the oil to enter the pump inlet.
    Type: Application
    Filed: June 3, 2008
    Publication date: July 29, 2010
    Inventors: Michael John Crabtree, Philip Fletcher, Jeffrey Forsyth
  • Patent number: 7745500
    Abstract: A viscous fluid, such as heavy crude oil which is too viscous to enable it to be pumped from a flowing phase of a reservoir into and along a pipeline for delivery to a refinery or other storage facility, may be contacted with a formulation to reduce its viscosity. The formulation comprises a polymeric material AA which includes —O— moieties pendent form a polymeric backbone thereof and said material is optionally cross-linked. In one embodiment, the formulation may comprise polyvinyl alcohol. In an alternative embodiment, the formulation may comprise a cross-linked polymeric material, such as cross-linked polyvinyl alcohol. After the viscous composition has been transported to a desired location, it may be separated from the other components.
    Type: Grant
    Filed: September 27, 2004
    Date of Patent: June 29, 2010
    Assignee: Advanced Gel Technology Limited
    Inventors: Philip Fletcher, Michael John Crabtree, Donald Eagland, Nicholas John Crowther
  • Patent number: 7559370
    Abstract: Water problems in the production of oil or gas from subterranean formations is addressed by providing a method of restricting passage of a fluid from a first location to a second location in a subterranean formation by injecting into the formation a formulation comprising a first material, for example a dialdehyde, arranged to cross-link a second polymeric material, for example a polyvinyl alcohol, thereby to form a polymeric material of high viscosity which may block the passage between the first and second locations.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: July 14, 2009
    Assignee: Oilflow Solutions Holdings Limited
    Inventors: Michael John Crabtree, Nicholas John Crowther, Donald Eagland, Philip Fletcher
  • Publication number: 20070018455
    Abstract: Deformed pipes used for lining host pipes are provided with internal and external inserts to maintain generally U-shaped cross-sectional configuration of the pipe ends. When the pipes are transported to an installation site, the thermoplastic pipe ends with inserts applied match one another, enabling the pipe ends to be fused to one another. Upon locating the pipes within the host pipe, the interior inserts can be removed by floating the inserts through an open end of the pipe or using a “pig” drawn through the pipe.
    Type: Application
    Filed: July 21, 2005
    Publication date: January 25, 2007
    Inventors: William Bezner, John Crabtree
  • Publication number: 20060182500
    Abstract: A section of a host pipe is removed, a flange is placed at one end of the host pipe section and split sleeve halves are secured to one another and at one end to the flange to cantilever the split sleeve from the end of the host pipe. A deformed thermoplastic liner is drawn through the host pipe and split sleeve and reformed to its cylindrical configuration by introducing steam under pressure. Once reformed, the split sleeve halves are removed, the end portion of the rerounded liner is cut and an adapter flange is fused on the end of the cut liner portion. The split sleeve halves are reapplied about the rounded liner with the flange on the adapter bearing against an end face of the flanges of the split sleeve.
    Type: Application
    Filed: March 28, 2006
    Publication date: August 17, 2006
    Applicants: Pipe Liners, Inc., Weatherford U.S.L.P.
    Inventors: John Crabtree, James Tate
  • Patent number: 7022761
    Abstract: A printing paste containing: a) 5 to 30% by weight of a polyurethane, b) 1 to 20% by weight of an organic fixing agent, c) 0 to 50% by weight of one or more further ingredient(s) and d) water as the remainder, the sum of the amounts of components (a)+(b)+(c)+(d) being 100%, is suitable for printing textile materials.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: April 4, 2006
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Alan John Crabtree, Martin Lane
  • Publication number: 20040173115
    Abstract: A printing paste containing: a) 5 to 30% by weight of a polyurethane, b) 1 to 20% by weight of an organic fixing agent, c) 0 to 50% by weight of one or more further ingredient(s) and d)water as the remai nder, the sum of the amounts of components (a)+(b)+(c)+(d) being 100%, is suitable for printing textile materials
    Type: Application
    Filed: December 17, 2003
    Publication date: September 9, 2004
    Inventors: Alan John Crabtree, Martin Lane
  • Patent number: 5357769
    Abstract: A refrigerator includes an improved air return system providing a channel of air below the crisper pans. Particularly, a separator top is positioned above a separator insulation body to define a space therebetween providing an air flow path for channeling return air flow. An inlet to the space is positioned proximate the front of the separator wall and an outlet is positioned proximate the rear of the separator. An air flow passage through the separator is in communication with the outlet for returning refrigerated air to the freezer compartment.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: October 25, 1994
    Assignee: Whirlpool Corporation
    Inventors: John Crabtree, Daryl L. Harmon