Patents by Inventor Michael D. Leshner

Michael D. Leshner 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: 6931120
    Abstract: An electronic circuit for connecting a standard analog telephone to the analog microphone and loudspeaker connections on a personal computer and for separating the talk signal from the combined talk/listen signal occurring at the telephone, effectively minimizing undesirable echo.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: August 16, 2005
    Assignee: MHL Communications, Inc.
    Inventors: Michael D. Leshner, Howard P. Leshner
  • Patent number: 5381771
    Abstract: An automatic control system is shown to vary the mixture of fuel-to-air in a conventional internal combustion engine to minimize resulting pollutants and maximize engine efficiency and performance. The system senses manifold vacuum and engine acceleration and based, in part, upon such inputs forces the mixture leaner until an instability event is detected at which time the system rapidly forces the mixture richer at a predetermined rate and time period to overcome the instability. The mixture is then again gradually forced leaner. The rate of leaning is controlled by the vacuum pressure so that no leaning occurs at or near full throttle and the rate of leaning is decreased either gradually or incrementally as power requirements decrease. The air-to-fuel ratio may be adjusted by regulating the introduction of secondary air or by adjusting the quantity of fuel injection. A control system for individually monitoring and correcting fuel injection rates of individual cylinders is provided.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: January 17, 1995
    Assignee: Lean Power Corporation
    Inventor: Michael D. Leshner
  • Patent number: 5265638
    Abstract: An intermittent suction device for removing fluids from a patient where the duty cycle between the OFF and ON cycles is controlled by a magnetically susceptible diaphragm that switches back and forth between first and second positions, representing ON and OFF positions, by controlling the differential pressure across the diaphragm. The diaphragm is biased toward it first position by a permanent magnet that acts to attract the flexible diaphragm. The device has few moving parts and its duty cycle and overall cycle times are easily adjusted by the user.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: November 30, 1993
    Assignee: BOC Health Care, Inc.
    Inventors: Russell J. Fischer, Ronald L. Tobia, Michael D. Leshner
  • Patent number: 5253536
    Abstract: A rotary type flowmeter having a variable orifice through which the flow to be measured is directed toward a rotatable needle. A preload is also applied and which may be varied as desired. By the use of the variable orifice and with the preload, the same flowmeter may be used for differing ranges of flow by minor adjustment and various indicating scales may be taylored to the particular flow being monitored.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: October 19, 1993
    Assignee: BOC Health Care, Inc.
    Inventors: Thomas C. Jones, Michael D. Leshner
  • Patent number: 5251601
    Abstract: An automatic control system is shown to vary the mixture of fuel-to-air in a conventional internal combustion engine to minimize resulting pollutants and maximize engine efficiency and performance. The system senses manifold vacuum and engine acceleration and based, in part, upon such inputs forces the mixture leaner until an instability event is detected at which time the system rapidly forces the mixture richer at a predetermined rate and time period to overcome the instability. The mixture is then again forced leaner. The rate of leaning is controlled by the vacuum pressure so that no leaning occurs at or near full throttle and the rate of leaning is decreased as power requirements decrease Further, secondary air is introduced substantially tangentially to the primary air/fuel flow to maximize mixture between the primary and secondary flows.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: October 12, 1993
    Assignee: Lean Power Corporation
    Inventor: Michael D. Leshner
  • Patent number: 5117794
    Abstract: A bistable fluidic switch is switched from its stable state by a pin inserted in the power nozzle of the bistable fluidic switch, the pin being controlled by an electromagnetic actuator which is controlled from an electronic computer. The fluidic switch element has a cross-over type interaction region and a common outlet leading to a pair of output passageways, one of which returns fuel to the supply tank, and the other of which leads to the air intake manifold of the engine. Air is introduced into the output passageway leading to the engine so as to air atomize the fuel before injection of same into the air intake manifold.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: June 2, 1992
    Assignee: Bowles Fluidics Corporation
    Inventors: Michael D. Leshner, Ernest W. Chesnutis, Jr., Christian Williams, Ronald Stouffer
  • Patent number: 4904182
    Abstract: The present invention relates to a two stage venturi for a catalytic burner wherein a large exit aperture size and a small air entrainment opening are used to provide a low velocity, rich fuel/air mixture for the pre-heating process followed by a small exit aperture size and a large air entrainment opening to provide a high velocity, lean fuel/air mixture for the catalytic combustion process. Concentric rotating sleeves are used to vary the size of the exit apertures and the air entrainment openings.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: February 27, 1990
    Inventor: Michael D. Leshner
  • Patent number: 4827887
    Abstract: An adaptive charge mixture control for an internal combustion engine includes four input signals supplied to an OR gate to generate a net "go rich" signal supplied to a servo motor controlling an air/fuel charge mixture control valve for an internal combustion engine. The servo is also supplied with a "go lean" fixed signal tending to lean out the air/fuel mixture. The four "go rich" signals include a first signal derived from a comparison of engine speed with a predetermined minimum (i.e., idle) level; a second signal derived from comparing throttle positions with a preset minimum throttle position; a third signal derived from comparing engine deceleration rate with a preset engine deceleration rate; and a fourth signal derived from a measurement of engine instantaneous power output.
    Type: Grant
    Filed: April 20, 1988
    Date of Patent: May 9, 1989
    Assignee: Sonex Research, Inc.
    Inventor: Michael D. Leshner
  • Patent number: 4588373
    Abstract: A catalytic stove is provided comprising a mixing chamber having one end adapted to receive a fuel can and an opposite end provided with a diffuser. A plate provided with a grid of between 200 and 400 openings per square inch extends across the exit end of the diffuser. A catalytic surface is coated on the exit portion of the plate. The catalyst is selected from the group consisting of platinum, palladium, rhodium and iridium.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: May 13, 1986
    Assignee: David Landau
    Inventors: Thomas Tonon, Claudio Bruno, Michael D. Leshner
  • Patent number: 4368707
    Abstract: An adaptive charge forming system for an internal combustion engine is disclosed which monitors a parameter of engine combustion efficiency, such as power output, and derives a signal indicating the direction and amplitude of power change. The fuel mixture control system responds to changes in power output, regardless of their source, to maintain the engine air/fuel ratio in a preferred region. In a preferred embodiment, engine crankshaft angular acceleration is monitored to maintain the air/fuel mixture at the lean limit. A stepping motor is used to control a value for bleeding additional air into the charge; a clock provides steady pulses to the motor, tending to lean the mixture, while enrichment is effected upon the detection of each weak combustion event. The clock frequency thus sets the equilibrium rate of weak combustion events, defining the optimal mixture to be supplied to the engine.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: January 18, 1983
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner
  • Patent number: 4232643
    Abstract: A charge forming system is disclosed which monitors a parameter of engine combustion efficiency, such as power output, and derives a signal indicating the sense of power change. A fuel mixture control system responds to an indication of increasing power to continually and progressively lessen the fuel/air ratio to attain the leanest possible mixture consistent with maximum instantaneous engine power output. In a preferred embodiment liquid fuel is vaporized before delivery to the engine combustion chambers, and a variable orifice provided to enhance the flow characteristics of the vaporized fuel.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: November 11, 1980
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner
  • Patent number: 4064748
    Abstract: The torque produced by an internal combustion engine is measured by algebraically combining averaged cylinder pressure with inlet manifold pressure, and manifesting the sum thereof. By multiplying the summed result by a factor representing engine speed, a direct measure of engine horsepower is obtained. The result may be displayed by an indicator or the like to provide an indication useful in operating or adjusting the engine.
    Type: Grant
    Filed: August 19, 1976
    Date of Patent: December 27, 1977
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner
  • Patent number: 4015569
    Abstract: A charge forming system for metering vaporized liquid fuel to an internal combustion engine. Liquid fuel is metered to a vaporizing chamber which is heated by the exhaust gases of the engine. Within the chamber the liquid vaporizes and expands rapidly, whereupon it is delivered to the intake ports of the engine to be mixed with air in the manifold or cylinders. The amount of fuel and air admitted to the engine is varied as function of both foot pedal position and developed engine power. The fuel-to-air ratio of the mixture provided to the cylinders is decreased as developed engine power increases. In a preferred embodiment additional fuel vapor is supplied to each combustion chamber by means of fuel vapor injectors, the net mixture supplied to the cylinders being leaner than the stoichiometric ratio.
    Type: Grant
    Filed: January 7, 1976
    Date of Patent: April 5, 1977
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner
  • Patent number: 4015572
    Abstract: An improved charge forming system for an internal combustion engine. Fuel and air are metered to the engine as functions of both operator control and manifested engine power output. The incremental changes in fuel flow and air flow which are effected as a result of changes in engine power output are unequal so that the total fuel-air mix ingested by the engine becomes leaner as engine power increases. When the fuel-air mixture becomes so lean that engine power decreases, the charge forming system enriches the mixture so that the system maximizes engine power for any given rate of fuel flow. In a presently preferred embodiment the fuel-air ratio supplied to the engine is leaner than the stoichiometric mixture.
    Type: Grant
    Filed: January 7, 1976
    Date of Patent: April 5, 1977
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner
  • Patent number: RE29978
    Abstract: A combined fuel vapor injector and igniter system for internal combustion engines and method of operating the engine therewith in which liquid fuel enters an injector-igniter device, is vaporized using the engine's heat of combustion, and exits in vapor form into the engine combustion chamber where it mixes with air or an air-fuel mixture which has entered through an intake valve, or port, and the resulting air-fuel mixture is ignited. The system assures reliable ignition, so that engines may be run at leaner than stoichiometric air-fuel ratios to take advantage of increased fuel economy, and reduced emissions of the oxides of nitrogen hydrocarbons and carbon monoxide. Power output equalization is attained between cylinders.
    Type: Grant
    Filed: March 23, 1977
    Date of Patent: May 1, 1979
    Assignee: Fuel Injection Development Corporation
    Inventors: Ervin Leshner, Michael D. Leshner