Patents by Inventor Robert Martin Kalstabakken

Robert Martin Kalstabakken 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).

  • Interlock system for enclosures
    Patent number: 7275770
    Abstract: An apparatus to interlock a multi-door enclosure includes an actuating member slidably mountable to the enclosure between a primary door and a secondary door. The actuating member includes a first end extendable through an opening in a door post between the primary door and the secondary door. The apparatus includes a latching member slidably mounted to the actuating member and extending over a second end of the actuating member to engage a portion of the secondary door.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: October 2, 2007
    Assignee: Hoffman Enclosures, Inc.
    Inventors: Anteneh Guebre-Tsadik, Robert Martin Kalstabakken, Joseph David Ricke, Dean Jerome Bergerson