Patents by Inventor Stephen J. Harrison

Stephen J. Harrison 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: 7823628
    Abstract: This invention provides a thermal energy system comprising a heat exchanger for transferring thermal energy between a source and a load, the heat exchanger having a primary side associated with the source, and a secondary side for conducting a fluid associated with the load, wherein the secondary side of the heat exchanger is passively back-flushed upon consumption of a portion of the fluid. Passive back-flushing prevents fouling of the heat exchanger due to sediments, scale, and mineral deposits which may be present in the circulating fluid.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: November 2, 2010
    Assignee: Queen's University at Kingston
    Inventor: Stephen J. Harrison
  • Patent number: 7823582
    Abstract: This invention relates to a method and apparatus for a solar collector having intergral control of the maximum temperature that it can reach, thereby avoiding excessive stagnation temperatures in the collector.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: November 2, 2010
    Assignee: Queen's University at Kingston
    Inventors: Stephen J. Harrison, Qin Lin, Lucio C. Mesquita, David A. Valletta
  • Patent number: 7171972
    Abstract: This invention provides a thermal energy system comprising a heat exchanger for transferring thermal energy between a source and a load, the heat exchanger having a primary side associated with the source, and a secondary side for conducting a fluid associated with the load, wherein the secondary side of the heat exchanger is passively back-flushed upon consumption of a portion of the fluid. Passive back-flushing prevents fouling of the heat exchanger due to sediments, scale,and mineral deposits which may be present in the circulating fluid.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: February 6, 2007
    Assignee: Queen's University at Kingston
    Inventor: Stephen J. Harrison
  • Patent number: 7143762
    Abstract: This invention relates to a method and apparatus for a solar collector having intergral control of the the maximum temperature that it can reach, thereby avoiding excessive stagnation temperatures in the collector.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: December 5, 2006
    Assignee: Queen's University at Kingston
    Inventors: Stephen J. Harrison, Qin Lin, Lucio C. Mesquita, David A. Valletta
  • Patent number: 6827091
    Abstract: A thermal energy system including a heat exchanger for transferring thermal energy between a source and a load, the heat exchanger having a primary side associated with the source, and a secondary side for conducting a fluid associated with the load, wherein the secondary side of the heat exchanger is passively back-flushed upon consumption of a portion of the fluid. Passive back-flushing prevents fouling of the heat exchanger due to sediments, scale, and mineral deposits which may be present in the circulating fluid.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: December 7, 2004
    Assignee: Queen's University at Kingston
    Inventor: Stephen J. Harrison
  • Publication number: 20040187861
    Abstract: This invention relates to a method and apparatus for a solar collector having intergral control of the the maximum temperature that it can reach, thereby avoiding excessive stagnation temperatures in the collector.
    Type: Application
    Filed: February 6, 2004
    Publication date: September 30, 2004
    Inventors: Stephen J. Harrison, Qin Lin, Lucio C. Mesquita, David A. Valletta
  • Publication number: 20030034149
    Abstract: This invention provides a thermal energy system comprising a heat exchanger for transferring thermal energy between a source and a load, the heat exchanger having a primary side associated with the source, and a secondary side for conducting a fluid associated with the load, wherein the secondary side of the heat exchanger is passively back-flushed upon consumption of a portion of the fluid. Passive back-flushing prevents fouling of the heat exchanger due to sediments, scale, and mineral deposits which may be present in the circulating fluid.
    Type: Application
    Filed: August 12, 2002
    Publication date: February 20, 2003
    Inventor: Stephen J. Harrison
  • Patent number: 5487206
    Abstract: A door closing device comprises a piston (12) having at one end a seal (21) which seals the interface between the piston and a housing (10). The seal (21) also acts as a one-way valve and carries a pressure relief valve (37).
    Type: Grant
    Filed: January 16, 1994
    Date of Patent: January 30, 1996
    Assignee: Jerbron Limited
    Inventors: Peter E. Brown, Stephen J. Harrison
  • Patent number: 4937914
    Abstract: The piston of a door control device is assembled from a channel and cups welded on to opposite ends of the channel. A valve assembly is mounted in one of the cups. Rollers extend between opposite sides of the channel and co-operate with teeth on a rotatable member to which a control arm is secured.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: July 3, 1990
    Assignee: Jebron Limited
    Inventors: Stephen J. Harrison, Peter E. Brown
  • Patent number: 4502180
    Abstract: The piston assembly of a hydraulically controlled door closer has a tubular wall, plugs secured in end portions of the wall and a separate rack secured inside the tubular wall between the plugs by formations on the plugs.
    Type: Grant
    Filed: November 26, 1982
    Date of Patent: March 5, 1985
    Assignee: Jebron Limited
    Inventors: Stephen J. Harrison, Peter E. Brown