Patents by Inventor David J. Pristash

David J. Pristash 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: 7732085
    Abstract: A fuel cell device includes at least one and preferably two gas storage chambers, the gas storage chambers being connected via gas flow channels to a fuel cell membrane, such as a proton exchange membrane. A piston in each gas storage chamber moves to compress the gas upon being subject to an acceleration force. A flow control opens upon a predetermined condition being achieved to provide the compressed gases to a fuel cell membrane.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: June 8, 2010
    Assignee: Pemery Corp.
    Inventor: David J. Pristash
  • Publication number: 20100000434
    Abstract: An apparatus for the generation of electricity that may be in a “standby” mode for long periods of time, i.e. many years. Thus, in one embodiment of the invention, a fuel cell may include at least one of the following features or components: a membrane, and/or storage tanks or cells for hydrogen and oxygen, and/or an “inertial” switch, which may optionally be assembled in close proximity to a membrane. The inertial switch, when activated, may rupture the membrane and allow the hydrogen and oxygen to mix in a fuel cell.
    Type: Application
    Filed: January 19, 2005
    Publication date: January 7, 2010
    Inventor: David J. Pristash
  • Patent number: 7534514
    Abstract: A fuel cell includes a stack of electrolyte membranes joined to one another to form an interior space and an exterior space. Fuel, such as hydrogen, is provided to the interior space. The electrolyte membranes are circular and joined to adjacent membranes at the outer perimeters to enclose the interior space. A stack of such membrane assemblies is provided on a shaft and is rotated within a housing to drive off byproduct water. The water is collected and recirculated by spraying over the fuel cell stack for cooling and hydration.
    Type: Grant
    Filed: October 3, 2005
    Date of Patent: May 19, 2009
    Assignee: Pemery Corp.
    Inventor: David J Pristash
  • Patent number: 7442462
    Abstract: A fuel cell apparatus includes tandem storage tanks containing activation devices that release the oxidant gas and fuel gas to the fuel cell membrane when needed. The membrane assemblies surround the storage tanks, overlapping one another in a configuration more suited to use in environments with limited space than the traditional, stacked membrane assemblies. The activation devices are triggered by inertia to puncture membrane valves so that the oxidant gas and fuel gas is kept from the fuel cell membrane prior to inertial triggering and is supplied to the membrane after inertial triggering. The activation devices include spring loaded pivoting arms on supports that swing downward and outward upon subjecting the device to inertial forces.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: October 28, 2008
    Assignee: Pemery Corporation
    Inventor: David J. Pristash
  • Patent number: 5909874
    Abstract: A die of uniformly distributed material comprising a plurality of faces having a triangular shape and a plurality of numbers imprinted on the die. Each of the plurality of numbers imprinted on the die appear on a separate face, wherein each number appears on at least twice on the die. The dice are capable of generating random numbers, including negative and positive numbers, for use with board games, lotteries, stock market determinations, scientific work and other applications where random numbers are needed. For more complex random number generation, the system includes at least two dice having a distinct color and at least twenty faces, and a pattern of numbers imprinted on each dice, each number of the pattern appearing on a separate face of the dice, wherein the numbers have a different color than the dice.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: June 8, 1999
    Inventors: Maurice Daniel, David J. Pristash, Michael D. Miller
  • Patent number: 5136480
    Abstract: Thin panel illuminator includes a solid transparent panel member having one or more deformed output regions which cause light entering the panel along an input edge thereof to be emitted along the length of the panel. Light may be transmitted to one or more panel input edges from one or more light sources utilizing transition devices which convert easily focused light generally to the shape of the panel input surfaces.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: August 4, 1992
    Assignee: Lumitex, Inc.
    Inventors: David J. Pristash, Jeffery R. Parker
  • Patent number: 5005108
    Abstract: Thin panel illuminator includes a solid transparent panel member having one or more deformed output regions which cause light entering the panel along an input edge thereof to be emitted along the length of the panel. Light may be transmitted to one or more panel input edges from one or more light sources utilizing transition devices which convert easily focused light generally to the shape of the panel input surfaces.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: April 2, 1991
    Assignee: Lumitex, Inc.
    Inventors: David J. Pristash, Jeffery R. Parker
  • Patent number: 4755918
    Abstract: Reflector system includes a reflector having an ellipsoidal portion and a hemispherical portion joined together at the intersection of a plane passing through one of the foci of the ellipsoidal portion normal to the major axis of the ellipsoidal portion. A light source is generally positioned at the focus. The ellipsoidal portion extends forwardly of the focus and terminates in an opening covered by a mirror extending normal to the major axis of the ellipsoidal portion for redirecting light rays emanating from the light source back through the reflector. The center axis of the hemispherical portion intersects the focus, and such hemispherical portion extends rearwardly of the focus and terminates in another opening through which the light rays are redirected by the mirror to a final focus located exteriorly of the reflector.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: July 5, 1988
    Assignee: Lumitex, Inc.
    Inventors: David J. Pristash, Timothy J. Bodnar
  • Patent number: 4050536
    Abstract: A power driven wheeled vehicle with a power source consisting of an internal combustion engine, a compressor section, a heat reservoir and driven motor located at the wheels. The said internal combustion engine drives the said compressor section which uses the said engine's exhaust and cooling air as the input source. The said compressor supplies the said reservoir which supplies the said drive motors through a control valve driving the wheels of the said vehicle.
    Type: Grant
    Filed: February 25, 1976
    Date of Patent: September 27, 1977
    Inventor: David J. Pristash