Patents by Inventor John D. Grant

John D. Grant 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: 5285709
    Abstract: A machine head, especially for precision tuning of a guitar string or strings, avoids the slackness between the cog and worm gear drive of the existing design which can give rise to tuning slip and imprecise tuning. The proposed machine head has a spindle to which a string is secured at one end and carries an arm (2a). Adjusting screw (3) cooperates threadingly with an abutment (7) and the end of the adjusting screw bears on the arm whereby rotation of the adjusting screw determines the position of the arm and hence tension in the string.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: February 15, 1994
    Inventor: John D. Grant
  • Patent number: 5027269
    Abstract: A method and apparatus for maintaining active sessions between communicating logical units in a computer network when an application system fails without having to re-establish the active sessions. By activating a persistent sessions capability at one of the logical units, the active sessions can be suspended and maintained while attempts at recovery are made. Recovery attempts include restarting the failed application or switching the suspended sessions to an alternate instance of the logical unit. The suspended sessions are resynchronized with the application system and session activity is resumed.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: June 25, 1991
    Assignee: International Business Machines Corporation
    Inventors: John D. Grant, James L. Hall, Barron C. Housel, III
  • Patent number: 4167874
    Abstract: A device for indicating the volume of liquid in a fuel tank or like container includes a linear variable differential transformer (LVDT) mounted within the tank, which is divided into a liquid containing section and a gas containing section by a longitudinally movable piston. Pressure gas is provided to the gas containing section of the tank through a port in a tank wall, and urges the piston to follow the liquid level in the tank. The LVDT has a fixed coil housing with a fixed electrical input and a rotatable core actuator. The core actuator is coupled for rotation in response to movement of the piston. Rotation of the actuator effects translational movement of the core within the coil, thereby producing a variable electrical output in response to changes in liquid volume.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: September 18, 1979
    Assignee: Sundstrand Corporation
    Inventor: John D. Grant