Patents by Inventor Lee E. Leppo

Lee E. Leppo 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: 6046684
    Abstract: A single button contrast control which can bi-directionally adjust a contrast function in one of two directions so as to increase or decrease the contrast of a display. An interrupt generator generates an interrupt for each user activation of a single button control key. A control circuit incrementally adjusts the contrast function in accordance with the interrupts generated. If no interrupts are generated within a predetermined period of time following a previous interrupt, the control circuit changes the direction in which the contrast is incrementally adjusted so that the next time a user activates the single button control key the control will be adjusted in the other direction.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: April 4, 2000
    Assignee: Telxon Corporation
    Inventors: Richard A. Hamersley, Mark F. Pleso, Lee E. Leppo
  • Patent number: 5844400
    Abstract: The present invention relates to a battery discrimination system which provides for charging a battery of a mobile terminal where the battery may be any one of a plurality of types of batteries each having different charge characteristics. The system includes a mobile terminal, the mobile terminal including a battery pack housing for storing at least one of a plurality of batteries. The plurality of batteries including batteries of a first battery type and batteries of a second battery type, the batteries of the first battery type having charge characteristics different from the batteries of the second battery type. The system further includes a docking cradle for receiving and storing the mobile terminal. The cradle includes a battery charger for charging the at least one of a plurality of batteries.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: December 1, 1998
    Assignee: Telxon Corporation
    Inventors: Dean A. Ramsier, Lee E. Leppo, Timothy J. Manns, Clifford P. Brake
  • Patent number: 5835366
    Abstract: A secondary battery boost system which includes a primary power supply for a computing device, and a secondary power supply for the computing device. The boost system also includes a boost circuit operative to increase the power output of the secondary power supply applied to the computing device. Upon the output of the primary power supply falling below a level suitable for properly powering the computing device, the boost circuit feeds the computing device power from the secondary power supply. The boost circuit also boosts the power output of the secondary power supply so that the secondary power supply can be smaller and more light weight.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: November 10, 1998
    Assignee: Telxon Corporation
    Inventors: Mark F. Pleso, Lee E. Leppo
  • Patent number: 5744939
    Abstract: A monitoring circuit for a Li-Ion battery pack charging apparatus is disclosed. The monitoring circuit modifies charging time for a Li-Ion battery pack inserted in the charging apparatus to compensate for temperature effects on the charging current input to the battery pack. In one embodiment of the monitoring circuit, a comparator is utilized to compare a voltage across the battery pack, V.sub.charge, to a set point voltage value, V.sub.sp. The set point voltage value, V.sub.sp, is taken off a temperature sensor circuit comprising a voltage divider circuit. The voltage divider circuit includes at least one thermistor in a ground connected leg of the divider. In a second embodiment of the monitoring circuit of the present invention, a differential amplifier is coupled to opposite ends of a low resistance sensor resistor. The sensor resistor is coupled between charging circuitry and the Li-Ion battery pack to be charged. The voltage differential across the resistor, V.sub.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: April 28, 1998
    Assignee: Telxon Corp.
    Inventor: Lee E. Leppo
  • Patent number: 5736271
    Abstract: A battery pack adapted to be removably inserted into a battery receiving compartment of a portable electronic device for supplying power to the device is disclosed. The battery pack includes a plurality of cylindrically shaped battery cells and an elongated casing having two spaced apart ends and defining an interior region in which the plurality of battery cells are disposed. Outer cylindrical surfaces of first and second cells and an inner surface of the casing define two elongated open regions extending away from the first end of the casing. The battery pack also includes an integrated circuit board disposed intermediate a first end of the casing and negative and positive connector plates of the cells and includes conductive traces electrically coupled to the connector plates of the first and second cells.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: April 7, 1998
    Assignee: Telxon Corporation
    Inventors: James M. Cisar, Lee E. Leppo
  • Patent number: 5365160
    Abstract: A charging system monitors the rate of change in battery voltage, adjusts the rate of charging, and checks the changes in battery voltage following adjustments in the rate of charging to observe a predetermined sequence of voltage changes that signifies when a battery is fully charged. The charging system determines the slope between consecutive battery voltage measurements. The charging system charges a battery at the full battery capacity in response to positive or zero voltage slope measurements and reduces the charging rate in response to negative voltage slope measurements. A nickel-cadmium battery is fully charged when at least one sequence of a negative slope, followed by a decrease in charging rate, then a positive or flat slope, followed by an increase in charge rate, and finally another negative slope is observed.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: November 15, 1994
    Assignee: Telxon Corporation
    Inventors: Lee E. Leppo, Charles A. Rinkes
  • Patent number: 5200726
    Abstract: An electric switch assembly for use with a magnetic reed switch includes a trigger that is movable with respect to a housing between an open position and a closed position and that includes a trigger magnet. The switch assembly further includes a second magnet, fixed relative to the housing, that is located adjacent the first magnet when the trigger is in the open position. The magnets are oriented such that their magnetic fields tend to cancel each other when the trigger is in its open position. This provides an increased disparity in the magnetic field reaching the magnetic reed switch between the open position and closed position and eliminates the need for precision alignment and individual adjustment of the magnetic reed switch at the point of manufacture.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: April 6, 1993
    Assignee: Telxon Corporation
    Inventors: Lee E. Leppo, James A. Campo