Patents by Inventor Kenneth Ehalt

Kenneth Ehalt 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: 4931656
    Abstract: A dynamic discharge circuit for a capacitively-charged electrical device includes, in one embodiment, a bipolar transistor placed in the discharge path, with the base of the transistor being connected so that conduction is held off by the voltage generated by an illuminated PV-diode. When the PV-diode is shut off, base-drive is immediately supplied through a base resistor in dynamic fashion by the very capacitive charge that is to be discharged. In another embodiment, the resistor is replaced with a diode-transistor combination, thus eliminating the delaying RC product inherent with the use of a resistor. In yet a further embodiment, an SCR placed in the discharge path is also dynamically driven. Discharge times on the order of about 5 microseconds are attained with the latter two embodiments and it is found that this discharge time is relatively constant regardless of the value of the capacitance to be discharged.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: June 5, 1990
    Assignee: Dionics Inc.
    Inventors: Kenneth Ehalt, William Sheng, Bernard L. Kravitz
  • Patent number: 4912335
    Abstract: A dynamic discharge circuit for a capacitively-charged electrical device includes, in one embodiment, a bipolar transistor placed in the discharge path, with the base of the transistor being connected so that conduction is held off by the voltage generated by an illuminated PV-diode. When the PV-diode is shut off, base-drive is immediately supplied through a base resistor in dynamic fashion by the very capacitive charge that is to be discharged. In another embodiment, the resistor is replaced with a diode-transistor combination, thus eliminating the delaying RC product inherent with the use of a resistor. In yet a further embodiment, an SCR placed in the discharge path is also dynamically driven. Discharge times on the order of about 5 microseconds are attained with the latter two embodiments and it is found that this discharge time is relatively constant regardless of the value of the capacitance to be discharged.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: March 27, 1990
    Assignee: Dionics Inc.
    Inventors: Kenneth Ehalt, William Sheng, Ronald P. Colino, Bernard L. Kravitz