Patents by Inventor Jan Hagbert Hvidsten

Jan Hagbert Hvidsten 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).

  • Pulse counting apparatus for measuring mechanical movement of a machine such as a mining machine
    Patent number: 4107516
    Abstract: Pulse Counter means adapted to determine the position of a mining machine including a rotary member. The pulse counter means includes an arrangement of phototransistors and photodiodes which is adapted to derive electrical pulse signals in response to movement of the rotary member therebetween. Circuitry in the form of logic gates and switching transistors is provided so that operational errors of the phototransistor and diodes are located.The pulse counter means also includes a memory which is kept on by an internal battery when external power is removed so that the counted position is not lost when power failures occur.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: August 15, 1978
    Assignee: Coal Industry (Patents) Limited
    Inventor: Jan Hagbert Hvidsten