Patents by Inventor Donald L. Griffes

Donald L. Griffes 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).

  • Make-up air control system apparatus
    Patent number: 5285771
    Abstract: The apparatus is adapted to provide for the controlling of incoming replacement or make up air in a cooking equipment ventilation system. The apparatus is dependent upon an air plenum surrounding the hood or an enclosure which contains the incoming, unconditioned make up air. The air is discharged into the cooking primarily by adjustable air controllers. The controllers are located at the lower lateral edge of the hood. The direction of the incoming replacement or make up air can be directed as desired for the required thermal conditions. The apparatus can be an integral part of a new ventilation hood assembly or system, or can be retrofit to a ventilation hood assembly or system already in operation.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: February 15, 1994
    Assignee: New England Ventilation Technologies
    Inventor: Donald L. Griffes
  • Assemblable buoyancy float
    Patent number: D330402
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: October 20, 1992
    Inventor: Donald L. Griffes
  • Spark arrestor apparatus
    Patent number: D343700
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: January 25, 1994
    Assignee: New England Ventilation Technologies
    Inventor: Donald L. Griffes