Patents by Inventor Roger W. Christensen

Roger W. 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: 8568368
    Abstract: A contrast media delivery system having a flow regulator assembly that allows a practitioner to regulate the passage of contrast media into a burette while minimizing turbulence and the formation of microbubbles in the contrast media. The flow regulator assembly can be actuated by twisting a rotatable cap. When the rotatable cap is released, the flow of contrast media from the inlet to the burette is stopped. A diffuser having a contact surface is provided which disperses contrast media as it passes into the burette to ensure that the contrast media flows smoothly and uniformly down the wall of the burette and into the volume of contrast media. A float and seating assembly which provides optimal sealing of the outlet of the burette while also allowing separation of the float from the seat when the burette is being refilled with contrast media.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: October 29, 2013
    Assignee: Merit Medical Systems, Inc.
    Inventors: Fred P. Lampropoulos, Kenneth H. Carter, Roger W. Christensen, Gar Hendry
  • Publication number: 20090259199
    Abstract: A contrast media delivery system having a flow regulator assembly that allows a practitioner to regulate the passage of contrast media into a burette while minimizing turbulence and the formation of microbubbles in the contrast media. The flow regulator assembly can be actuated by twisting a rotatable cap. When the rotatable cap is released, the flow of contrast media from the inlet to the burette is stopped. A diffuser having a contact surface is provided which disperses contrast media as it passes into the burette to ensure that the contrast media flows smoothly and uniformly down the wall of the burette and into the volume of contrast media. A float and seating assembly which provides optimal sealing of the outlet of the burette while also allowing separation of the float from the seat when the burette is being refilled with contrast media.
    Type: Application
    Filed: April 14, 2008
    Publication date: October 15, 2009
    Inventors: Fred P. Lampropoulos, Kenneth H. Carter, Roger W. Christensen, Gar Hendry
  • Patent number: 6953142
    Abstract: Apparatus for locating and grasping a flange include a plurality of clamp arms that move from an unclamped position to a clamped position, clamping the flange to the upper surface of a support platform. A plurality of pins are adapted to move upwardly into flange holes within the flange for positioning the flange during the clamping action. The locating and the clamping of the flange to the upper surface of the support platform are accomplished by a single pusher rod that is connected to both the pins and the clamps. The method comprises using a single pusher rod connected to both the pins and the clamps for locating and clamping the flange to the upper surface of a platform.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: October 11, 2005
    Assignee: GSG, LLC
    Inventors: John D. Pingilley, Roger W. Christensen, Njell J. Cooley, Michael J. McCreary, Don Stabenow, John D. Hogue