Patents by Inventor David J. Gennrich

David J. Gennrich 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).

  • Compact shutter assembly for a luminaire
    Patent number: 7033047
    Abstract: A shutter section includes a stack of circular plates independently rotatable in a nest formed as a laminar formation of rings. The plates have central openings defining a light path. Four central plates in the stack are shutter guide plates with radial guide slots slideably holding shutter blades. Two outer pairs of plates are shutter drive plates connected by cams to the shutter blades. Simultaneous rotation of a shutter guide plate and associated shutter drive plate causes rotation of an associated shutter blade around the light path. Rotation of a shutter drive plate while the associated shutter guide plate is stationary causes the cam to move the associated shutter blade radially. The nest is enclosed by end plates. A motor section has motors driving pinions to rotate the circular plates. The circular plates, rings pinions and shutter blades are made of sheet metal. Shutters may be provided as interleaved pairs each driven by a pair of rotatable drive plates.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: April 25, 2006
    Assignee: Electronic Theatre Controls, Inc.
    Inventors: David J. Gennrich, Sheldon Roberts
  • Cover for a transport temperature control unit
    Patent number: D460165
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: July 9, 2002
    Assignee: Thermo King Corporation
    Inventors: Larry E. Hanson, Scott A. Pearce, Jeffrey R. Staszak, David P. Boebel, David J. Gennrich