Patents by Inventor Leonard G. Ewing

Leonard G. Ewing 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).

  • Apparatus for adjustably controlling the size of an ice bank
    Patent number: 4939908
    Abstract: A method and apparatus for adjustably controlling the growth of the solid phase of a substance from around a cooling mechanism, such as the growth of an ice bank around cooling coils, while also minimizing chances of inaccurate control by referencing the apparent resistance of the liquid that is actually in the system rather than a standard value for the same. The invention uses four springs as probes that are positioned relative to one another and are linked with a detachable control circuit in a manner which provides a dead-band in the unit's operation by monitoring the resistance of the liquid at two different distances from the cooling mechanism while the reference resistance is monitored at an even greater distance.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: July 10, 1990
    Inventors: Leonard G. Ewing, Milton L. Chesnut
  • Drain hole strainer plug for ice cooled units
    Patent number: 4751752
    Abstract: A drainhole strainer plug comprising a raised central grating member, a concentric recessed trickle-down member, and a plug.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: June 21, 1988
    Assignee: Lancer Corporation
    Inventor: Leonard G. Ewing