Patents by Inventor Dimitri A. Podorashi

Dimitri A. Podorashi 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: 9823668
    Abstract: A pressure regulator for a hydrogen storage system, wherein the pressure regulator is adapted to operate at temperatures below ?50° C., while minimizing the need for separate sealing elements and O-rings. The pressure regulator includes a main body including an inner cavity bounded by an interior wall, a piston disposed in the inner cavity, the piston including a first channel disposed adjacent a first portion, wherein the first portion is adapted to cooperate with the interior wall to form a seal between the piston and the interior wall, a first biasing device disposed in the first channel, wherein the first biasing device is adapted to exert a force on the first portion of the piston to form a seal between the first portion and the interior wall, and an end cap coupled to the main body thereby enclosing the piston to form an outlet pressure chamber.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: November 21, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Rainer Pechtold, Dimitri A. Podorashi, Hans Weidner, Wolfgang Markard
  • Publication number: 20150268672
    Abstract: A pressure regulator for a hydrogen storage system, wherein the pressure regulator is adapted to operate at temperatures below ?50° C., while minimizing the need for separate sealing elements and O-rings. The pressure regulator includes a main body including an inner cavity bounded by an interior wall, a piston disposed in the inner cavity, the piston including a first channel disposed adjacent a first portion, wherein the first portion is adapted to cooperate with the interior wall to form a seal between the piston and the interior wall, a first biasing device disposed in the first channel, wherein the first biasing device is adapted to exert a force on the first portion of the piston to form a seal between the first portion and the interior wall, and an end cap coupled to the main body thereby enclosing the piston to form an outlet pressure chamber.
    Type: Application
    Filed: June 4, 2015
    Publication date: September 24, 2015
    Inventors: Rainer Pechtold, Dimitri A. Podorashi, Hans Weidner, Wolfgang Markard
  • Patent number: 9103499
    Abstract: One exemplary embodiment includes a gas storage tank comprising a structural outer layer, an internal liner layer, an annular boss, and a liquid sealant disposed between the overlapped section of the liner layer and the boss to provide a gas-tight seal.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: August 11, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Markus Lindner, Dimitri A. Podorashi, Axel Junge
  • Patent number: 9074703
    Abstract: A pressure regulator for a hydrogen storage system, wherein the pressure regulator is adapted to operate at temperatures below ?50° C., while minimizing the need for separate sealing elements and O-rings. The pressure regulator includes a main body including an inner cavity bounded by an interior wall, a piston disposed in the inner cavity, the piston including a first channel disposed adjacent a first portion, wherein the first portion is adapted to cooperate with the interior wall to form a seal between the piston and the interior wall, a first biasing device disposed in the first channel, wherein the first biasing device is adapted to exert a force on the first portion of the piston to form a seal between the first portion and the interior wall, and an end cap coupled to the main body thereby enclosing the piston to form an outlet pressure chamber.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: July 7, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Rainer Pechtold, Dimitri A. Podorashi, Hans Weidner, Wolfgang Markard
  • Patent number: 8251373
    Abstract: The performance and durability of static and dynamic seals for hydrogen storage and supply systems has been improved by utilizing a spring-energized and plastic coated radial seal in combination with at least a mating surface that has been treated by one of a variety of procedures. These procedures include applying to the mating surface a low-friction, hard, and hydrogen impervious coating, chemically polishing the mating surface, and electrochemically polishing the mating surface. Each of these procedures significantly reduces, on a microscopic scale, the surface roughness of the mating surface. The seal can thus form a tighter and more gas-tight seal with the smoother mating surface so as to decrease the loss of hydrogen gas across the seal. The smoother mating surface can also improve seal life by reducing seal surface wear.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: August 28, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Leonid C. Lev, Dimitri A. Podorashi, Michael J. Lukitsch, Thorsten Michler, Xingcheng Xiao
  • Publication number: 20120138616
    Abstract: One exemplary embodiment includes a gas storage tank comprising a structural outer layer, an internal liner layer, an annular boss, and a liquid sealant disposed between the overlapped section of the liner layer and the boss to provide a gas-tight seal.
    Type: Application
    Filed: December 3, 2010
    Publication date: June 7, 2012
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Markus Lindner, Dimitri A. Podorashi, Axel Junge
  • Publication number: 20110012313
    Abstract: The performance and durability of static and dynamic seals for hydrogen storage and supply systems has been improved by utilizing a spring-energized and plastic coated radial seal in combination with at least a mating surface that has been treated by one of a variety of procedures. These procedures include applying to the mating surface a low-friction, hard, and hydrogen impervious coating, chemically polishing the mating surface, and electrochemically polishing the mating surface. Each of these procedures significantly reduces, on a microscopic scale, the surface roughness of the mating surface. The seal can thus form a tighter and more gas-tight seal with the smoother mating surface so as to decrease the loss of hydrogen gas across the seal. The smoother mating surface can also improve seal life by reducing seal surface wear.
    Type: Application
    Filed: July 17, 2009
    Publication date: January 20, 2011
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Leonid C. Lev, Dimitri A. Podorashi, Michael J. Lukitsch, Thorsten Michler, Xingcheng Xiao
  • Publication number: 20090242043
    Abstract: Hydrogen gas flow from high pressure storage to a lower pressure hydrogen-using device is managed using one or more axial flow pressure regulators comprising a cup-shaped housing with an inlet for high pressure hydrogen gas at one end of the flow axis and a closure with a low pressure hydrogen outlet at the other end of the flow axis. A piston head with a piston stem are aligned on the flow axis and a hydrogen flow passage is formed up the stem and through the piston head to the hydrogen flow outlet. One or more combinations of a corrugated tubular bellows (or like expansive sealing vessel) with static seals attaching one bellows end to the piston stem or head and the other bellows end to the housing or closure are used to accommodate axial movement of the piston while isolating and containing hydrogen gas flow from a high pressure chamber at a flow entrance to the piston stem to a low hydrogen pressure chamber at the piston head and closure outlet.
    Type: Application
    Filed: January 29, 2009
    Publication date: October 1, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Leonid C. Lev, Dimitri A. Podorashi, Michael J. Lukitsch, Rainer Pechtold, Hans Weidner