Patents by Inventor Ludwig Kuspert

Ludwig Kuspert 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: 5122878
    Abstract: An input circuit and a television tuner for at least two frequency bands. The television tuner has a joint pre-amplifier whose output is connected to two independent, switchable and tunable band-pass filter circuits for the two frequency bands, preferably extending from VHF band I up to and including the hyperband. To achieve a high selection effect with a simple circuit structure and low space requirement, a two-stage switching device is connected to the output of the pre-amplifier, to which device separate inputs of the independent band filters are connected. The input circuit has a pre-circuit filter comprising a frequency-determining capacitor, and a series circuit connected parallel thereto including three frequency-determining coils. The first coil, like the capacitor, is connected at one end to ground and the third coil, like the capacitor, has its output end connected to the pre-amplifier input.
    Type: Grant
    Filed: June 20, 1989
    Date of Patent: June 16, 1992
    Assignee: Telefunken electronic GmbH
    Inventors: Franz Heigl, Ludwig Kuspert