Patents by Inventor Leonard G. Marianowski

Leonard G. Marianowski 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: 6905793
    Abstract: In a fuel cell stack, a bipolar separator plate having two joined together coextensive separator plate elements having perpendicularly disposed corrugated regions and forming a coolant chamber there between. By virtue of this arrangement, fuel and oxidant gases fed to the fuel cell stack have a cross-flow relationship. Internal stack manifolding is provided for distribution of a coolant to each of the coolant chambers.
    Type: Grant
    Filed: May 5, 2003
    Date of Patent: June 14, 2005
    Assignee: Gas Technology Institute
    Inventors: Leonard G. Marianowski, Gerald J. Koncar, Qinbai Fan, Jeremy Chervinko
  • Publication number: 20040224205
    Abstract: In a fuel cell stack, a bipolar separator plate having two joined together coextensive separator plate elements having perpendicularly disposed corrugated regions and forming a coolant chamber there between. By virtue of this arrangement, fuel and oxidant gases fed to the fuel cell stack have a cross-flow relationship. Internal stack manifolding is provided for distribution of a coolant to each of the coolant chambers.
    Type: Application
    Filed: May 5, 2003
    Publication date: November 11, 2004
    Inventors: Leonard G. Marianowski, Gerald J. Koncar, Qinbai Fan, Jeremy Chervinko
  • Patent number: 6723462
    Abstract: A polymer electrolyte membrane fuel cell stack having a plurality of substantially planar fuel cell units, each of which comprises an anode electrode, a cathode electrode and a polymer electrolyte membrane disposed between the anode electrode and the cathode electrode. A metal bipolar plate is disposed between the anode electrode of one fuel cell unit and the cathode electrode of an adjacent fuel cell unit. The metal bipolar plate is made of a chromium-nickel austenitic alloy, in which the chromium and the nickel, on a combined basis, make up at least about 50% by weight of the alloy.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: April 20, 2004
    Assignee: Gas Technology Institute
    Inventors: Qinbai Fan, Jeremy R. Chervinko, Michael Onischak, Leonard G. Marianowski
  • Publication number: 20040038104
    Abstract: A polymer electrolyte membrane fuel cell stack having a plurality of substantially planar fuel cell units, each of which comprises an anode electrode, a cathode electrode and a polymer electrolyte membrane disposed between the anode electrode and the cathode electrode. A metal bipolar plate is disposed between the anode electrode of one fuel cell unit and the cathode electrode of an adjacent fuel cell unit. The metal bipolar plate is made of a chromium-nickel austenitic alloy having a nitrogen content of zero, in which the chromium and the nickel, on a combined basis, make up at least about 50% by weight of the alloy.
    Type: Application
    Filed: August 25, 2003
    Publication date: February 26, 2004
    Inventors: Qinbai Fan, Jeremy R. Chervinko, Michael Onischak, Leonard G. Marianowski
  • Publication number: 20030203266
    Abstract: A bipolar separator plate suitable for use in polymer electrolyte membrane fuel cell stacks, which plate is made a composition having in a range of 1 to 4 different graphite components and at least one resin, wherein at least one of the graphite components has graphite particles having a mean diameter in a range of about 10 microns to about 50 microns.
    Type: Application
    Filed: April 30, 2002
    Publication date: October 30, 2003
    Inventors: Jeremy Chervinko, Qinbai Fan, Michael Onischak, Leonard G. Marianowski
  • Publication number: 20030104257
    Abstract: A method for producing a graphite bipolar separator plate for a polymer electrolyte membrane fuel cell in which a powder mixture having at least one graphite component and at least one resin is placed into a plate mold and pressed at substantially ambient temperature, resulting in formation of a cold-pressed plate. The cold-pressed plate is heated to a temperature suitable for curing the cold-pressed plate, resulting in formation of the graphite bipolar separator plate.
    Type: Application
    Filed: December 3, 2001
    Publication date: June 5, 2003
    Inventors: Jeremy Chervinko, Qinbai Fan, Michael Onischak, Leonard G. Marianowski
  • Publication number: 20020172849
    Abstract: A polymer electrolyte membrane fuel cell stack having a plurality of substantially planar fuel cell units, each of which comprises an anode electrode, a cathode electrode and a polymer electrolyte membrane disposed between the anode electrode and the cathode electrode. A metal bipolar plate is disposed between the anode electrode of one fuel cell unit and the cathode electrode of an adjacent fuel cell unit. The metal bipolar plate is made of a chromium-nickel austenitic alloy, in which the chromium and the nickel, on a combined basis, make up at least about 50% by weight of the alloy.
    Type: Application
    Filed: April 6, 2001
    Publication date: November 21, 2002
    Inventors: Qinbai Fan, Jeremy R. Chervinko, Michael Onischak, Leonard G. Marianowski
  • Publication number: 20020134969
    Abstract: A composition of electrically conducting carbon/graphite particles, a bonding agent and a mold release agent and a method employing the composition for producing a bipolar plate for a polymer electrolyte membrane fuel cell in which the composition is introduced into a mold suitable for compression molding the bipolar plate and pressed in the mold at a temperature sufficient to melt the bonding agent and activate the mold release agent, thereby forming the bipolar plate. The mold release agent acts to prevent sticking of the bipolar plate to the mold. In accordance with one preferred embodiment, the mold release agent is a mixture of at least one fatty acid and at least one polyolefin.
    Type: Application
    Filed: February 14, 2001
    Publication date: September 26, 2002
    Inventors: Jeremy R. Chervinko, Qinbai Fan, Michael Onischak, Leonard G. Marianowski
  • Patent number: 6379833
    Abstract: A molten carbonate fuel cell having an anode electrode, a cathode electrode, and an electrolyte matrix disposed between the anode electrode and the cathode electrode. An electrode support constructed of a high porosity reticulated foam material is disposed on an anode electrode face of at least one of the anode electrode and the cathode electrode facing away from the electrolyte matrix and forming a plurality of pores. An electrolyte is disposed within at least a portion of the plurality of pores, whereby at least a portion of the electrolyte flows into the electrolyte matrix during initial conditioning of the fuel cell.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: April 30, 2002
    Assignee: Institute of Gas Technology
    Inventors: Andy H. Hill, Chakravarthy Sishtla, Leonard G. Marianowski
  • Patent number: 6261710
    Abstract: A separator plate for a polymer electrolyte membrane fuel cell stack constructed of at least two coextensive sheet metal elements shaped to promote the distribution of reactant gases to the electrodes of the fuel cell units of the fuel cell stack. The coextensive sheet metal elements are nestled together and form a coolant flow space therebetween.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: July 17, 2001
    Assignee: Institute of Gas Technology
    Inventor: Leonard G. Marianowski
  • Patent number: 5942347
    Abstract: A gas impervious bi-polar separator plate for a proton exchange membrane fuel cell having at least one electronically conductive material in an amount in a range of about 50% to about 95% by weight of the separator plate, at least one resin in an amount of at least about 5% by weight of the separator plate, and at least one hydrophilic agent, where the electronically conductive material, the resin, and the hydrophilic agent are substantially uniformly dispersed throughout the separator plate.
    Type: Grant
    Filed: May 20, 1997
    Date of Patent: August 24, 1999
    Assignee: Institute of Gas Technology
    Inventors: Gerald J. Koncar, Leonard G. Marianowski
  • Patent number: 5503945
    Abstract: A separator plate for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced.
    Type: Grant
    Filed: August 30, 1994
    Date of Patent: April 2, 1996
    Assignee: Institute of Gas Technology
    Inventors: Randy J. Petri, John Meek, Robert P. Bachta, Leonard G. Marianowski
  • Patent number: 5362578
    Abstract: A separator plate for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: November 8, 1994
    Assignee: Institute of Gas Technology
    Inventors: Randy J. Petri, John Meek, Robert P. Bachta, Leonard G. Marianowski
  • Patent number: 5342706
    Abstract: A fully internally manifolded fuel cell stack is provided by each separator plate and electrolyte in the fuel cell stack having a plurality of aligned perforations forming gas manifolds extending for the length of the cell stack. Each perforation through the separator plate is surrounded by a flattened manifold wet seal structure extending to contact the electrolytes on each face of the separator plate to form separator plate/electrolyte wet seals under cell operating conditions. Conduits through the extended manifold wet seal structure provides gas communication between one set of manifolds and the anode chambers on one face of the separator plates, and conduits through the extended manifold wet seal structure on the opposite face of the separator plates provides gas communication between a second set of the manifolds and the cathode chambers on the other face of the separator plates. Extended wet seal structures formed of thin plate material provide limited flexibility and resiliency to assure good sealing.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: August 30, 1994
    Assignee: Institute of Gas Technology
    Inventors: Leonard G. Marianowski, Randy J. Petri
  • Patent number: 5240786
    Abstract: An assembly of fuel cell components comprising a matrix tape having an active area and a peripheral wet seal area, an anode and/or a cathode in contact with a face of the matrix tape, the anode and cathode extending beyond a periphery of the active area of the matrix tape and contacting the peripheral wet seal area, and a portion of the peripheral wet seal area forming a frame around the anode and cathode to prevent gas crossover between the electrodes during cell operation and to prevent oxidation of the edges of the electrodes.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: August 31, 1993
    Assignee: Institute of Gas Technology
    Inventors: Estela T. Ong, Leonard G. Marianowski
  • Patent number: 5227256
    Abstract: A fully internally manifolded fuel cell stack is provided by each separator plate, current collector, electrode, and electrolyte in the fuel cell stack having a plurality of aligned perforations forming gas manifolds extending for the length of the cell stack. Each perforation through the separator plate is surrounded by a flattened manifold wet seal structure extending to contact the current collector and/or electrode on each face of the separator plate to form electrolyte/electrode wet seals under cell operating conditions.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: July 13, 1993
    Assignee: Institute of Gas Technology
    Inventors: Leonard G. Marianowski, Frank C. Schora, Randy J. Petri, Mark G. Lawson
  • Patent number: 5077148
    Abstract: A fully internally manifolded fuel cell stack is provided by each separator plate and electrolyte in the fuel cell stack having a plurality of aligned perforations forming gas manifolds extending for the length of the cell stack. Each perforation through the separator plate is surrounded by a flattened manifold wet seal structure extending to contact the electrolytes on each face of the separator plate to form separator plate/electrolyte wet seals under cell operating conditions.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: December 31, 1991
    Assignee: Institute of Gas Technology
    Inventors: Frank C. Schora, Leonard G. Marianowski, Randy J. Petri, Mark G. Lawson
  • Patent number: 5071718
    Abstract: A process for production of electricity in molten carbonate fuel cells using a sulfur contaminated fuel gas wherein anode polarization is reduced by use of a porous anode of greater than about 10 weight percent copper resulting in improved fuel cell operation using fuel gas mixtures of over about 10 volume percent carbon monoxide and up to about 10 ppm hydrogen sulfide.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: December 10, 1991
    Assignee: Institute of Gas Technology
    Inventors: Leonard G. Marianowski, Gerald L. Anderson, Elias H. Camara
  • Patent number: 4999155
    Abstract: The present invention is directed to a method for forming porous oxide dispersion strengthened molten carbonate fuel cell anodes having improved anode creep resistance. The method comprises the steps of forming an alloy powder comprised of a base metal and an alloy metal, forming the alloy into a porous anode structure by sintering, and then placing the porous anode structure under conditions in which the base metal is reduced and the alloy metal is oxidized, thereby internally oxidizing the alloy metal to form oxide particles therein.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: March 12, 1991
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Estela T. Ong, Diane S. Erickson, Leonard G. Marianowski
  • Patent number: 4963442
    Abstract: A fully internally manifolded molten carbonate fuel cell stack is provided by each separator plate and electrolyte in the fuel cell stack having an aligned perforation in each corner area forming a gas manifold extending for the length of the cell stack. Each perforation through the separator plate is surrounded by a flattened manifold wet seal structure extending to contact the electrolytes on each side of the separator plates to form a separator plate/electrolyte wet seal under cell operating conditions.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: October 16, 1990
    Assignee: Institute of Gas Technology
    Inventors: Leonard G. Marianowski, Randy J. Petri