Patents by Inventor Hal Richardson

Hal Richardson 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).

  • Backflow prevention for high pressure gradient systems
    Patent number: 7754075
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: July 13, 2010
    Assignee: Waters Technologies Corporation
    Inventors: Hal Richardson, Richard W. Andrews
  • BACKFLOW PREVENTION FOR HIGH PRESSURE GRADIENT SYSTEMS
    Publication number: 20080251141
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Application
    Filed: May 1, 2008
    Publication date: October 16, 2008
    Applicant: WATERS INVESTMENTS LIMITED
    Inventors: Hal Richardson, Richard W. Andrews
  • Backflow prevention for high pressure gradient systems
    Patent number: 7396469
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: July 8, 2008
    Assignee: Waters Investments Limited
    Inventors: Richard W. Andrews, Hal Richardson
  • Backflow prevention for high pressure gradient systems
    Publication number: 20050008516
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Application
    Filed: August 4, 2004
    Publication date: January 13, 2005
    Inventors: Hal Richardson, Richard Andrews
  • Backflow prevention for high pressure gradient systems
    Patent number: 6780315
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: August 24, 2004
    Assignee: Waters Investments Limited
    Inventors: Hal Richardson, Richard W. Andrews
  • Convertible harness, and methods of use and manufacture
    Publication number: 20040140152
    Abstract: A convertible harness includes a waist strap, shoulder straps, and a stowable pelvis enclosing assembly. In one embodiment, the pelvis enclosing assembly includes a pouch attached to the back of the harness, two leg loops, a crotch strap, and an attachment mechanism. A wearer releases the stowable pelvis enclosing assembly from the pouch, brings the crotch strap through his legs, attaches the attachment mechanism to an attachment point at the front of the harness, and tightens the strap. This converts the harness into a full body harness. The harness also includes a stowable rappelling assembly, in one embodiment, which includes a rappel assembly pouch, an anchor mechanism, a descender, a rappel line, and a harness attachment mechanism. The wearer pulls the anchor mechanism from the pouch, attaches the descender to an attachment point at the front of the harness, anchors the anchor mechanism, and rappels using the assembly.
    Type: Application
    Filed: October 30, 2003
    Publication date: July 22, 2004
    Inventor: Hal Richardson
  • Backflow prevention for high pressure gradient systems
    Publication number: 20040108273
    Abstract: Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.
    Type: Application
    Filed: December 9, 2002
    Publication date: June 10, 2004
    Applicant: Waters Investments Limited
    Inventors: Hal Richardson, Richard W. Andrews