Patents by Inventor Mark S. Grendahl

Mark S. Grendahl 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: 7014152
    Abstract: A conduit racking device provides an efficient and accurate method for racking conduit and marking locations of conduit entry holes to be formed in an electrical box. The conduit racking device is a shelf with a plurality of alignment holes arranged in a spaced pattern for receiving conduit. A brace is connected to the shelf for attaching the conduit racking device to a building structure.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: March 21, 2006
    Inventor: Mark S. Grendahl
  • Patent number: 6907674
    Abstract: A template provides a quick and accurate method for marking locations of conduit entry holes to be formed in an electrical panelboard. The template is a rectangular sheet that is divided into longitudinal spacer zones, transverse spacer zones, a longitudinal marking zone and graduated marking zones. Each of the marking zones has multiple apertures used in making marks on the electrical panelboard to identify hole locations.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: June 21, 2005
    Inventor: Mark S. Grendahl
  • Patent number: 6906260
    Abstract: A reusable protective cover provides a means for sealing off an opening leading into the interior chamber of an electrical outlet box during construction activities to prevent foreign material from entering the chamber. The temporary protective cover has a flat rectangular back plate, a rectangular collar with independently-flexing wall sections, and a flange.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: June 14, 2005
    Inventor: Mark S. Grendahl
  • Patent number: 6854227
    Abstract: A jig (40) for locating anchor bolts in concrete standards of outdoor lighting installations comprises four complementary corner members (42) that can be interconnected and then secured together with fasteners (45) in the desired pattern. A second embodiment (70) comprised of male and female members (72, 74) is also disclosed.
    Type: Grant
    Filed: October 15, 2003
    Date of Patent: February 15, 2005
    Inventor: Mark S. Grendahl
  • Publication number: 20040188126
    Abstract: A reusable protective cover provides a means for sealing off an opening leading into the interior chamber of an electrical outlet box during construction activities to prevent foreign material from entering the chamber. The temporary protective cover has a flat rectangular back plate, a rectangular collar with independently-flexing wall sections, and a flange.
    Type: Application
    Filed: January 9, 2004
    Publication date: September 30, 2004
    Inventor: Mark S. Grendahl
  • Publication number: 20040113028
    Abstract: A conduit racking device provides an efficient and accurate method for racking conduit and marking locations of conduit entry holes to be formed in an electrical box. The conduit racking device is a shelf with a plurality of alignment holes arranged in a spaced pattern for receiving conduit. A brace is connected to the shelf for attaching the conduit racking device to a building structure.
    Type: Application
    Filed: December 5, 2003
    Publication date: June 17, 2004
    Inventor: Mark S. Grendahl
  • Publication number: 20040103550
    Abstract: A template provides a quick and accurate method for marking locations of conduit entry holes to be formed in an electrical panelboard. The template is a rectangular sheet that is divided into longitudinal spacer zones, transverse spacer zones, a longitudinal marking zone and graduated marking zones. Each of the marking zones has multiple apertures used in making marks on the electrical panelboard to identify hole locations.
    Type: Application
    Filed: September 25, 2003
    Publication date: June 3, 2004
    Inventor: Mark S. Grendahl
  • Publication number: 20040080088
    Abstract: A jig (40) for locating anchor bolts in concrete standards of outdoor lighting installations comprises four complementary corner members (42) that can be interconnected and then secured together with fasteners (45) in the desired pattern. A second embodiment (70) comprised of male and female members (72, 74) is also disclosed.
    Type: Application
    Filed: October 15, 2003
    Publication date: April 29, 2004
    Inventor: Mark S. Grendahl
  • Patent number: 6666441
    Abstract: A jig (40) for locating anchor bolts in concrete standards of outdoor lighting installations comprises four complementary corner members (42) that can be interconnected and then secured together with fasteners (45) in the desired pattern. A second embodiment (70) comprised of male and female members (72, 74) is also disclosed.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: December 23, 2003
    Inventor: Mark S. Grendahl
  • Publication number: 20030168793
    Abstract: A jig (40) for locating anchor bolts in concrete standards of outdoor lighting installations comprises four complementary corner members (42) that can be interconnected and then secured together with fasteners (45) in the desired pattern. A second embodiment (70) comprised of male and female members (72, 74) is also disclosed.
    Type: Application
    Filed: April 24, 2001
    Publication date: September 11, 2003
    Inventor: Mark S. Grendahl
  • Patent number: D528513
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: September 19, 2006
    Inventor: Mark S. Grendahl
  • Patent number: D475307
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: June 3, 2003
    Inventor: Mark S. Grendahl
  • Patent number: D489960
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: May 18, 2004
    Inventor: Mark S. Grendahl