Patents by Inventor John R. Fehling

John R. Fehling 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: 5625273
    Abstract: A battery safety device and circuit which prevents detrimental effect from the three most common battery faults generally encountered, excessive heat generation, voltage reversal and short circuit problems. The device includes fast acting circuits which latch the battery in the off state until reset by removal of the load, thereby preventing continued cycling of the battery between on and off states. The safety device includes a gating transistor such as a MOSFET (metal-oxide semiconductor field-effect transistor) switch, a latching timer (RC circuit) and a latching circuit having a transistor which turns on when a charge is 0.5 volts or greater. The safety device further comprises one or more sensor switches triggered by predetermined thermal, pressure, etc., conditions, with the switches being outside the circuit (and not affected by circuit conditions) and adapted to provide a latching voltage to the gating transistor under a detected untoward condition.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: April 29, 1997
    Assignee: Bren-Tronics Inc.
    Inventors: John R. Fehling, Charles Meierdierck, Donald F. Fagon
  • Patent number: 4431713
    Abstract: A high voltage cell or battery has its voltage reduced for lower voltage applications by means of volt lowering diodes i.e. p-n junction and resistive elements placed in series with the cells and the appliance to be electrically powered.
    Type: Grant
    Filed: April 15, 1982
    Date of Patent: February 14, 1984
    Assignee: Duracell Inc.
    Inventors: John R. Fehling, John P. Mathews, Thomas Yatabe