Patents by Inventor Karl Grever

Karl Grever 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: 6208740
    Abstract: A stereophonic magnetic induction sound system is disclosed which has an audio source, two ear pieces, each having an inductive pick-up coil, and a magnetic induction transmitter connected to the audio source and capable of transmitting different signals to the pick-up coils in the two ear pieces. The transmitter may have two or more antennas, a first conductor for transmitting one signal to one of the antennas, a second conductor for transmitting a different signal to the other antenna, and grounds connected to each antenna. The antennas are comprised of a core with a wires coiled about the core and are shaped and positioned on a user's neck to, at least partially, selectively transmit their respect signals toward a particular, near-by pick-up coil. A connector or stereophonic jack is used to connect the transmitter to an audio source, and a supporting member secures the antennas around a user's neck and restricts movement of the antennas relative to the neck.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: March 27, 2001
    Inventor: Karl Grever