Patents by Inventor Dieter Kaimann

Dieter Kaimann 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).

  • Fuel cell operational methods for hydrogen addition after shutdown
    Patent number: 8232014
    Abstract: A method for reducing the probability of an air/hydrogen front in a fuel cell stack is disclosed that includes closing anode valves for an anode side of the fuel cell stack to permit a desired quantity of hydrogen to be left in the anode side upon shutdown and determining a schedule to inject hydrogen during the time the fuel cell stack is shutdown. The pressure on an anode input line is determined and a discrete amount of hydrogen is injected into the anode side of the stack according to the determined schedule by opening anode input line valves based on the determined pressure along the anode input line so as to inject the hydrogen into the anode side of the stack.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: July 31, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: David A. Arthur, Dieter Kaimann, Thomas W. Tighe, Steven G. Goebel, John P. Salvador, Gary M. Robb, Daniel I. Harris, Joseph Nicholas Lovria, Balasubramanian Lakshmanan, Daniel T. Folmsbee
  • Multiple phase transfer valve for liquid hydrogen tank
    Patent number: 8161994
    Abstract: A product comprising a phase transfer valve, and wherein said phase transfer valve comprises an actuating valve housing having a housing interior; a liquid hydrogen inlet, a gaseous hydrogen inlet and a hydrogen outlet provided in said valve housing; an actuating valve slidably mounted in said housing interior; and wherein said actuating valve is moveable between a first position for sealing said gaseous hydrogen inlet from said hydrogen outlet and a second position for sealing said liquid hydrogen inlet from said hydrogen outlet.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: April 24, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Thorsten Rohwer, Dieter Kaimann
  • FUEL CELL OPERATIONAL METHODS FOR HYDROGEN ADDITION AFTER SHUTDOWN
    Publication number: 20110143243
    Abstract: A method for reducing the probability of an air/hydrogen front in a fuel cell stack is disclosed that includes closing anode valves for an anode side of the fuel cell stack to permit a desired quantity of hydrogen to be left in the anode side upon shutdown and determining a schedule to inject hydrogen during the time the fuel cell stack is shutdown. The pressure on an anode input line is determined and a discrete amount of hydrogen is injected into the anode side of the stack according to the determined schedule by opening anode input line valves based on the determined pressure along the anode input line so as to inject the hydrogen into the anode side of the stack.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 16, 2011
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: David A. Arthur, Dieter Kaimann, Thomas W. Tighe, Steven G. Goebel, John P. Salvador, Gary M. Robb, Daniel I. Harris, Joseph Nicholas Lovria, Balasubramanian Lakshmanan, Daniel T. Folmsbee
  • MULTIPLE PHASE TRANSFER VALVE FOR LIQUID HYDROGEN TANK
    Publication number: 20090229692
    Abstract: A product comprising a phase transfer valve, and wherein said phase transfer valve comprises an actuating valve housing having a housing interior; a liquid hydrogen inlet, a gaseous hydrogen inlet and a hydrogen outlet provided in said valve housing; an actuating valve slidably mounted in said housing interior; and wherein said actuating valve is moveable between a first position for sealing said gaseous hydrogen inlet from said hydrogen outlet and a second position for sealing said liquid hydrogen inlet from said hydrogen outlet.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 17, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Thorsten Rohwer, Dieter Kaimann
  • Fuel Cell Valve With Hydrophobically Enhanced Surface
    Publication number: 20080050625
    Abstract: A product including a control valve. The control valve includes a body having a passage therethrough defined by an inner surface. A movable part is provided for closing the passage. At least one of the inner surface or the movable part includes a hydrophobically enhanced surface.
    Type: Application
    Filed: August 24, 2006
    Publication date: February 28, 2008
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Dieter Kaimann, Dirk Wexel