Patents by Inventor Douglas A. Luehmann

Douglas A. Luehmann 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: 6861033
    Abstract: A water supply sub-system for connection to a main water supply system includes a storage tank having an inlet with a flow control valve for connection to the main water supply system. The sub-system may be disconnected from the main system and configured as a closed system for disinfecting the sub-system. An outlet line connects the storage tank to a pump that pumps water from the tank to a sub-system supply line. One or more branch connections may connect the sub-system supply line to high-demand water using devices, such as dialysis machines. The supply line may be a feedback loop. A shunt feedback loop parallel to the feedback loop of the supply line has a pressure control valve that regulates pressure in the supply line feedback loop. A filtration device may also be included to ensure the purity of the water circulating through the sub-system.
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: March 1, 2005
    Assignee: Gambro, Inc.
    Inventors: Stephen M. Mullins, Douglas A. Luehmann, John D. Bielefeld
  • Publication number: 20040195157
    Abstract: A water supply sub-system for connection to a main water supply system includes a storage tank having an inlet with a flow control valve for connection to the main water supply system. The sub-system may be disconnected from the main system and configured as a closed system for disinfecting the sub-system. An outlet line connects the storage tank to a pump that pumps water from the tank to a sub-system supply line. One or more branch connections may connect the sub-system supply line to high-demand water using devices, such as dialysis machines. The supply line may be a feedback loop. A shunt feedback loop parallel to the feedback loop of the supply line has a pressure control valve that regulates pressure in the supply line feedback loop. A filtration device may also be included to ensure the purity of the water circulating through the sub-system.
    Type: Application
    Filed: May 12, 2004
    Publication date: October 7, 2004
    Applicant: GAMBRO, INC.
    Inventors: Stephen M. Mullins, Douglas A. Luehmann, John D. Bielefeld
  • Publication number: 20030034305
    Abstract: A water supply sub-system for connection to a main water supply system, in which the sub-system includes: a storage tank having an inlet for connection to the main water supply system, an outlet and an outlet line connecting the outlet of the storage tank to a pump which pumps water from the tank to a sub-system supply line. One or more branch connections are connected to the sub-system supply line. Connectable to the one or more branch connections are one or more high-demand water using devices, such as dialyzer re-use machines. The subsystem may feed water to these high demand devices, and the sub-system and the one or more high demand devices may thus be substantially isolated from the main water supply system so that the high demands thereof will not adversely impact the water supply parameters. Thus, one or more lower demand machines, such as dialysis machines, may be connected to the main line without supply parameter disruption thereto.
    Type: Application
    Filed: January 7, 2002
    Publication date: February 20, 2003
    Applicant: Gambro, Inc.
    Inventors: Douglas A. Luehmann, Johnny W. Hannah, Stephen M. Mullins, John D. Bielefeld