Patents by Inventor John McCallister

John McCallister 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).

  • Method of controlling pressure variation in working fluids in a fluid circuit undergoing working pressure variations
    Patent number: 12092186
    Abstract: Described herein is a fluid circuit device. The device incorporates at least one pressure balancing valve located between at least two fluid volumes that can be in a pressure differential arrangement wherein the at least one pressure balancing valve acts to address a pressure differential by opening a fluid volume or volumes to a third pressure equalising volume. In use, the fluid circuit device may in one embodiment be used in an energy absorbtion apparatus.
    Type: Grant
    Filed: February 21, 2023
    Date of Patent: September 17, 2024
    Assignee: Holmes Solutions Limited Partnership
    Inventors: John McCallister, Mark Thomson, Murray Aitken, Stuart Clark
  • Method of controlling pressure variation in working fluids in a fluid circuit undergoing working pressure variations
    Patent number: 11598387
    Abstract: Described herein is a fluid circuit device. The device incorporates at least one pressure balancing valve located between at least two fluid volumes that can be in a pressure differential arrangement wherein the at least one pressure balancing valve acts to address a pressure differential by opening a fluid volume or volumes to a third pressure equalising volume. In use, the fluid circuit device may in one embodiment be used in an energy absorbtion apparatus.
    Type: Grant
    Filed: February 24, 2021
    Date of Patent: March 7, 2023
    Assignee: Holmes Solutions Limited Partnership
    Inventors: John McCallister, Mark Thomson, Murray Aitken, Stuart Clark
  • Fluid circuit device
    Patent number: 10948044
    Abstract: Described herein is a fluid circuit device. The device incorporates at least one pressure balancing valve located between at least two fluid volumes that can be in a pressure differential arrangement wherein the at least one pressure balancing valve acts to address a pressure differential by opening a fluid volume or volumes to a third pressure equalising volume. In use, the fluid circuit device may in one embodiment be used in an energy absorption apparatus.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: March 16, 2021
    Assignee: Holmes Solutions Limited Partnership
    Inventors: John McCallister, Mark Thomson, Murray Aitken, Stuart Clark
  • Golf club with swing directing ridge
    Patent number: 5263717
    Abstract: A golf club head which includes a swing directing ridge which extends down the hosel and across the club head body. The ridge includes a front sloped surface and a back sloped surface which extend outward from the club head body and hosel to terminate in a crest. The slope of the front and back sloped surfaces are varied from forward slopes to rearward slopes at different portions of the hosel and club head body to provide a wave-like visual cue which promotes desirable golf swing characteristics.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: November 23, 1993
    Inventor: John McCallister
  • Golf putter with swing directing cues
    Patent number: 5014992
    Abstract: A putter which provides visual cues to the golfer that promote a putting stroke having a vertical arc component. The club head includes a top surface which is slanted downward toward the ball and an elbow-shaped hosel which extends forwardly from the top face. The configuration and relationship between the hosel and top face creates a visual image which, when viewed from the golfer's perspective, promotes a pendulum-type putting stroke which includes a vertical arc component.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: May 14, 1991
    Inventor: John McCallister
  • Golf club head with visual swing-directing cues
    Patent number: 4550914
    Abstract: A golf club head adapted to provide a visual cue to a golfer which promotes an inside-outside forward swing of the club head. The club head includes three parallel, visual cue lines, which are provided by the outer edge of the club head toe and the two edges of the face lines. All three cue lines are slanted toward the golfer to provide a visual cue which promotes an outside-inside backswing, which results in a desired inside-outside front swing.
    Type: Grant
    Filed: September 6, 1984
    Date of Patent: November 5, 1985
    Inventor: John McCallister
  • Golf club head
    Patent number: D294616
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: March 8, 1988
    Inventor: John McCallister
  • Visual aid for golf stroke
    Patent number: D294619
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: March 8, 1988
    Inventor: John McCallister