Patents by Inventor David Christensen

David Christensen 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: 6520723
    Abstract: The present invention is a support rack with a built-in winch component. The rack unit includes at least two upright members and at least one horizontal support member connected at opposite ends to each of the upright members, and at least one shaft-receiving orifice located on and passing through either an upright member and/or horizontal support member. In some preferred embodiments, a plurality of the orifices may be included, e.g. at lower and higher levels of the uprights, as well as on the horizontal supports. Also, in some preferred embodiments, gussets are included to connect the uprights to the horizontal supports. These gussets may include shaft-receiving orifices. The upright members provide attachment to a motor vehicle, e.g. as part of the uprights, or as separate components.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: February 18, 2003
    Inventor: David Christensen
  • Publication number: 20010043845
    Abstract: The present invention is a support rack with a built-in winch component. The rack unit includes at least two upright members and at least one horizontal support member connected at opposite ends to each of the upright members, and at least one shaft-receiving orifice located on and passing through either an upright member and/or horizontal support member. In some preferred embodiments, a plurality of the orifices may be included, e.g. at lower and higher levels of the uprights, as well as on the horizontal supports. Also, in some preferred embodiments, gussets are included to connect the uprights to the horizontal supports. These gussets may include shaft-receiving orifices. The upright members provide attachment to a motor vehicle, e.g. as part of the uprights, or as separate components.
    Type: Application
    Filed: July 25, 2001
    Publication date: November 22, 2001
    Inventor: David Christensen
  • Publication number: 20010019689
    Abstract: The present invention is a reversible, portable winch for attachment to a load-bearing structure. It includes a shaft for rotation; a take-up reel for winding and unwinding a flexible securing strap, the take-up reel being connected to the shaft and affixed thereto for rotation therewith; a flexible securing strap attached to the take-up reel at a first end thereof; a plurality of bidirectional pawl-engaging teeth located about the shaft and so as to prevent and permit rotation of the take-up reel and the shaft by being engaged and disengaged with a pawl; a winding mechanism connected to the shaft or the take-up reel for winding the shaft and the take-up reel; support for supporting the shaft and the pawl. The winch is connected via its shaft to a support and the pawl may be movably connected to the support as well. The present invention is also a portable winch component set for installation into a support at some later time.
    Type: Application
    Filed: January 9, 2001
    Publication date: September 6, 2001
    Inventor: David Christensen
  • Patent number: 6203259
    Abstract: A reversible, portable winch for attachment to a utility rack. It includes a shaft for rotation; a take-up reel for winding and unwinding a flexible securing strap, the take-up reel being connected to the shaft and affixed thereto for rotation therewith; a flexible securing strap attached to the take-up reel at a first end thereof; a plurality of bidirectional pawl-engaging teeth located about the shaft and so as to prevent and permit rotation of the take-up reel and the shaft by being engaged and disengaged with a pawl; a winding mechanism connected to the shaft or the take-up reel for winding the shaft and the take-up reel; support for supporting the shaft and the pawl. The winch is connected via its shaft to a support and the pawl may be movably connected to the support as well. In preferred embodiments, the support is a component of a utility rack such as a ladder utility rack attached to the cargo bed of a pick-up truck or the top of a motor vehicle.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: March 20, 2001
    Inventor: David Christensen
  • Patent number: 6039074
    Abstract: A pressure-induced shut-off valve for a liquid delivery system with a back pressure regulator having a positive shut-off capability is provided. The pressure-induced shut-off valve may incorporate an integrated purge valve or an integrated cross flow nebulizer/vaporizer. The pressure-induced shut-off valve functions as a variable flow restrictor which automatically adjusts itself to provide a constant back pressure in the liquid line.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: March 21, 2000
    Assignee: Novellus Systems, Inc.
    Inventors: Ivo J. Raaijmakers, Chris W. Burkhart, David Christensen, Michael N. Susoeff
  • Patent number: 5513890
    Abstract: The present invention is a ladder utility rack for pick-up cargo beds. It has two parallel horizontal base rails and at least two vertical stanchion units and has at least two suspension rods, one from each stanchion, and has at least one inner support beam connected to the suspension rods. Each base rail has at least one horizontal and one vertical running wall and each is adapted to nest atop and against sidewalls of a cargo bed. These base rails are not connected to one another except via the stanchion units. These stanchion units have vertical legs running from each of the base rails upwardly and inwardly and terminate at a commonly connected horizontal cross member. A preferred embodiment includes four suspension rods, two from each stanchion, and two inner support beams, each beam connected to a forward and a rearward suspension rod.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: May 7, 1996
    Inventor: David Christensen
  • Patent number: 5470120
    Abstract: The present invention is a ladder utility rack for pick-up cargo beds. It has two parallel horizontal base rails and at least two vertical stanchion units and has at least two suspension rods, one from each stanchion, and has at least one inner support beam connected to the suspension rods. Each base rail has at least one horizontal and one vertical running wall and each is adapted to nest atop and against sidewalls of a cargo bed. These base rails are not connected to one another except via the stanchion units. These stanchion units have vertical legs running from each of the base rails upwardly and inwardly and terminate at a commonly connected horizontal cross member. A preferred embodiment includes four suspension rods, two from each stanchion, and two inner support beams, each beam connected to a forward and a rearward suspension rod.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: November 28, 1995
    Inventor: David Christensen
  • Patent number: 5454612
    Abstract: The present invention is a utility rail which may be used independently or as a mounting rail for a utility rack for pick-up truck cargo beds and the like with the rail. The rack is mounted with two present invention rails to cargo bed walls. Each rail has an elongated member having a generally L-shaped cross-section with a vertical segment and a horizontal segment, each segment having inside walls and outside walls; at least one elongated holding slot such as a cargo anchor T-slot running along at least a portion of the outside wall of either or both the vertical segment and the horizontal segment and locating grooves or starter holes located on either the horizontal segment or the vertical segment for penetrating said elongated member with a plurality of attachment devices for attaching said rail to a structure. The elongated member may also contain one or more hollows designed to add strength to the structure and conserve materials.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: October 3, 1995
    Inventor: David Christensen
  • Patent number: 5395019
    Abstract: The present invention is directed to a universal equipment mounting device. It includes a portable utility container having a bottom, sides and a top and capable of being locked; a mount adapted for interlocking with the portable utility container, and a latch attached to either of the portable utility container or the mount and adapted to interact with the other of the portable utility container and the mount so as to releasably connect the portable utility container to the mount. The invention is further characterized in that one of the portable utility container and the mount contains a male counterpart of a male-female interlock and the other of the portable utility container and the mount contains a female counterpart of a male-female interlock. The device is adapted such that the portable utility container is slidable onto the mount and is further securable thereto by means of the latch. In preferred embodiments, a plurality of mounts is used.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: March 7, 1995
    Inventor: David Christensen
  • Patent number: 5393114
    Abstract: The present invention is a reversible utility or mounting rail for pickup truck cargo beds. The rail is an elongated member having a generally L-shaped cross section with two legs 90 degrees opposed which are of equal or unequal length, each rail having an inside and an outside wall; at least one elongated holding slot running along at least a portion of the outside first wall; provision located on the outside first wall for mounting the elongated member to a structure with a plurality of attachment devices; at least one elongated holding slot running along at least a portion of the outside second wall; and provision on the outside second wall for mounting said elongated member to a structure with a plurality of attachment devices; thereby creating attaching capability for the rail by attachment through its first or its second walls or both and thereby creating a rail which may be mounted on a structure with either of its walls in the horizontal position.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: February 28, 1995
    Inventor: David Christensen
  • Patent number: 5271127
    Abstract: The present invention is directed to a tie down device for securing a load. It includes a bracket having a top and a bottom, a front and a back, a first side and an opposite side. It also includes a strap with the top of the bracket having means to attach one end of the strap to it and the strap is at least long enough to wrap around a load and to be placed between the sides of the bracket such as the strap extends past the bottom of the bracket. There is also a cam with one side of the bracket having means to rotatably mount the cam. The cam has a serrated surface with which to make contact and grip the strap. A plate is located on the opposite side of the bracket so that when the strap is placed between the sides of the bracket, the cam contacts the strap and restraining force is applied to the opposite sides of the strap by both the plate and the cam. An additional surface on the plate serves to captivate the strap once engaged.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: December 21, 1993
    Inventor: David Christensen
  • Patent number: D352692
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 22, 1994
    Inventor: David Christensen
  • Patent number: D352693
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 22, 1994
    Inventor: David Christensen
  • Patent number: D352694
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 22, 1994
    Inventor: David Christensen
  • Patent number: D352695
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 22, 1994
    Inventor: David Christensen
  • Patent number: D352696
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 22, 1994
    Inventor: David Christensen
  • Patent number: D352926
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 29, 1994
    Inventor: David Christensen
  • Patent number: D353128
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: December 6, 1994
    Inventor: David Christensen
  • Patent number: D356283
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: March 14, 1995
    Inventor: David Christensen
  • Patent number: D356775
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: March 28, 1995
    Inventor: David Christensen