Patents by Inventor Kenneth H. Oehrig

Kenneth H. Oehrig 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).

  • Coin telephone monitor circuit
    Patent number: 4326103
    Abstract: A circuit which monitors a coin telephone for coin ground, coin collect, coin return, stuck coin and ground fault conditions. Hall effect devices are used to detect the status of these conditions and to provide isolation between the coin telephone line and the coin telephone monitor circuit.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: April 20, 1982
    Assignee: GTE Automatic Electric Labs Inc.
    Inventor: Kenneth H. Oehrig
  • Electromagnetic device utilizing a pair of magnetically activated electronic switches
    Patent number: 4322708
    Abstract: An electromagnetic device utilizing a pair of Hall effect switches for detecting the presence or absence of an electrical current of a first and a second value. The device includes a flux generator for generating a field of magnetic flux and a magnetic circuit including a pair of adjustable cores for varying the amount of flux delivered to the Hall switches. A first Hall switch outputs a signal responsive to the presence or absence of a current of a first value and the second a signal representative of a current of a second value.
    Type: Grant
    Filed: October 14, 1980
    Date of Patent: March 30, 1982
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Kenneth H. Oehrig, Frank J. Petkewicz