Patents by Inventor Gary Hoffman

Gary Hoffman 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).

  • Publication number: 20120210734
    Abstract: Methods and devices are described for the concurrent delivery of elevated pressures and low temperatures to a sample, typically but not exclusively a biological sample. A medium that expands on cooling and/or freezing is employed with a sample immersed therein, typically but not exclusively encased in a sample container. Cooling the medium lowers the temperature and applies pressure to the sample such that reduced damage to a typical biosample occurs. Relatively long-lived metastable phases are also produced, including both metastable liquids and solids, without the need for very rapid cooling steps as required in conventional achievement of such metastable phases. Preliminary test data are also presented.
    Type: Application
    Filed: February 22, 2012
    Publication date: August 23, 2012
    Inventors: Gary A. Hoffman, Edmund René Troncoso
  • Publication number: 20100212316
    Abstract: A power generation system that includes a heat source loop that supplies heat to a turbine loop. The heat can be waste heat from a steam turbine, industrial process or refrigeration or air-conditioning system, solar heat collectors or geothermal sources. The heat source loop may also include a heat storage medium to allow continuous operation even when the source of heat is intermittent. In the turbine loop a working fluid is boiled, injected into the turbine, recovered condensed and recycled. The power generation system further includes a heat reclaiming loop having a fluid that extracts heat from the turbine loop. The fluid of the heat claiming loop is then raised to a higher temperature and then placed in heat exchange relationship with the working fluid of the turbine loop. The turbine includes one or more blades mounted on a rotating member.
    Type: Application
    Filed: February 18, 2010
    Publication date: August 26, 2010
    Inventors: Robert Waterstripe, Gary Hoffman, Richard Willoughby
  • Publication number: 20070130944
    Abstract: A method for improving compressor/exhaust turbine efficiency's due to better application and control of turbines created by multiple stages.
    Type: Application
    Filed: December 10, 2005
    Publication date: June 14, 2007
    Inventors: Bradley Pelletier, Robert Griggs, Gary Hoffman
  • Publication number: 20070095064
    Abstract: An externally heated engine is provided which has at least two pistons. The first piston has a first side (working side) and a second side opposite the first side. The first side of the first piston and the first cylinder define a first working chamber containing working fluid. The second side of the first piston and the first cylinder define a first opposite chamber containing an opposing fluid. A heater heats the working fluid in the first cylinder. Preferably, the cylinder is heated by a heat source so that the working fluid has a temperature of no more than 500° Fahrenheit with a temperature difference between the heat source and the working fluid of less than 5° Fahrenheit. The second piston reciprocates within a second cylinder, and has a first side (working side) and a second side opposite the first side. The first side and the cylinder define a working chamber containing working fluid. The second side of the piston and the cylinder define a second opposite chamber containing an opposing fluid.
    Type: Application
    Filed: June 5, 2006
    Publication date: May 3, 2007
    Inventors: Gary Hoffman, Richard Ide
  • Publication number: 20070057651
    Abstract: A load tap changer (LTC) having a plurality of windings is coupled to one of the primary and secondary of a power transformer in order to regulate the output voltage of the transformer. The LTC includes a plurality of taps physically and electrically connected to and along the windings and a contacting element is selectively moved along the taps to increase or decrease the output voltage of the transformer. The power transformer and the LTC windings are placed in a main tank and the taps are placed in an LTC tank. The temperature in the main tank and the temperature in the LTC tank are monitored by means of first and second temperature probes whose outputs are used to sense the temperature differential (TDIFF) between the main tank and the LTC tank and to determine if the LTC tank temperature exceeds the main tank temperature for a period of time exceeding a specified time period. Also included is circuitry for sensing the rate of change of TDIFF and determining if it exceeds a predetermined value.
    Type: Application
    Filed: September 13, 2006
    Publication date: March 15, 2007
    Inventor: Gary Hoffman
  • Publication number: 20070057652
    Abstract: A load tap changer (LTC) having a plurality of windings is coupled to one of the primary and secondary windings of a power transformer in order to regulate the output voltage of the power transformer. The LTC includes a plurality of taps physically and electrically connected to the LTC windings and the transformer's output voltage is increased/decreased by moving along the taps a contacting element whose movement is controlled by a rotating shaft driven by a motor. The tap being contacted is determined by sensing the direction and number of shaft rotations and by checking the number of shaft rotations specified to go from a tap to the next tap being contacted. The time for a full rotation of the shaft is also measured. Also, the temperature of the tanks containing the LTC taps and the power transformer is measured for each tap position.
    Type: Application
    Filed: September 13, 2006
    Publication date: March 15, 2007
    Inventors: Gary Hoffman, Thomas Tennille
  • Patent number: 6812674
    Abstract: In circuits and systems embodying the invention the condition of a battery may be tested and monitored while the battery is supplying a load current to a load and without interrupting that operation. A selectively enabled switch causes a test current to selectively flow through the battery and a test resistor of known value. The voltage across the test resistor is sensed to determine the value of the test current. The voltage across the battery is measured under two conditions, with the test current and without the test current flowing through it. These measurements and knowing the value of the test current enable the internal resistance of the battery under test to be calculated and monitored.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: November 2, 2004
    Inventor: Gary Hoffman
  • Patent number: 6808682
    Abstract: An assaying device composed of a test cartridge/cassette and cap/cover. When attached, the cap/cover seals the top of a sample well/opening on the cartridge/cassette in a fluid tight manner, to protect from contact with and contamination of the tested sample (for example, urine for drug testing), provide easier, cleaner handling of the test cartridge/cassette and prevent intermixing of another sample.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: October 26, 2004
    Assignee: Dtx, Inc.
    Inventors: E. Alan Bates, Jeffrey Kovalik, Gary Hoffman
  • Patent number: 6798874
    Abstract: A telephone system and method is provided including a processing system, such as a CTI system, in communication with a PBX and one or more telephone sets. The user selects a pre-programmed canned message, such as a DND message or status-state, from a list of messages and may further define the message with a user-defined message. The PBX recognizes the canned message and funnels the message to the processing system. The processing system matches the canned message and possibly the user-defined message to a software application stored in the processing system and corresponding to the messages. The user may program the software application to perform a specific function which may be stored in the processing system. The software application is launched and the telephone can be returned to a normal operating state regardless of whether the launched application has completed the intended task.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: September 28, 2004
    Assignee: Inter-Tel, Inc.
    Inventors: George F. Ohlinger, Gary Hoffman, Joel Donelson
  • Patent number: 6714022
    Abstract: The load current drawn from a power transformer is sensed to determine if and when the load current exceeds a predetermined threshold. The length of time the load current exceeds the threshold is also sensed. By monitoring the excess current flow and the length of time for which it flows, it is possible to anticipate a rise in the winding temperature of the power transformer and to initiate cooling before the windings have reached a critical temperature, as a function of the ambient temperature and/or the temperature of the transformer. Thus, systems embodying the invention include circuitry for sensing the current drawn from and/or by a transformer, determining when the current exceeds a predetermined value and timing circuits for sensing the length of time for which the excess current flows. The timing circuits are needed, in part, to differentiate between a transitory overload condition and a static, continuous, overload condition.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: March 30, 2004
    Inventor: Gary Hoffman
  • Publication number: 20020121901
    Abstract: In circuits and systems embodying the invention the condition of a battery may be tested and monitored while the battery is supplying a load current to a load and without interrupting that operation. A selectively enabled switch causes a test current to selectively flow through the battery and a test resistor of known value. The voltage across the test resistor is sensed to determine the value of the test current. The voltage across the battery is measured under two conditions, with the test current and without the test current flowing through it. These measurements and knowing the value of the test current enable the internal resistance of the battery under test to be calculated and monitored.
    Type: Application
    Filed: February 21, 2002
    Publication date: September 5, 2002
    Inventor: Gary Hoffman
  • Publication number: 20020113599
    Abstract: The load current drawn from a power transformer is sensed to determine if and when the load current exceeds a predetermined threshold. The length of time the load current exceeds the threshold is also sensed. By monitoring the excess current flow and the length of time for which it flows, it is possible to anticipate a rise in the winding temperature of the power transformer and to initiate cooling before the windings have reached a critical temperature, as a function of the ambient temperature and/or the temperature of the transformer. Thus, systems embodying the invention include means for sensing the current drawn from and/or by a transformer, determining when the current exceeds a predetermined value and timing means for sensing the length of time for which the excess current flows. The timing means are needed, in part, to differentiate between a transitory overload condition and a static, continuous, overload condition.
    Type: Application
    Filed: February 19, 2002
    Publication date: August 22, 2002
    Inventor: Gary Hoffman
  • Patent number: D300497
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: April 4, 1989
    Assignee: Chicago Cutlery Company
    Inventors: Richard Goebel, Michael Luebke, Gary Hoffman