Patents by Inventor Norman Lederman

Norman Lederman 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: 4908869
    Abstract: A multiple-loop magnetic induction system for improving communication with the hearing-impaired or to people in general who wish to listen privately to speech or music while being in the company of others or at a public location. The invention uses a particular grid made up of several electrical conductors as a means of generating an audio-frequency magnetic field which in turn couples to the telephone coils already present in most hearing aid units. The audio-frequency magnetic field is correlated to sound waveforms--speech, music, etc.--which is to be communicated. The grid configuration is selected so as to produce an end signal which is substantially independent of the location and the orientation of the hearing aid device within the area of the grid and which falls off precipitously outside of the region defined by the grid. The conductors which make up the grid configuration are enveloped in a flexible, lightweight matting which can be unrolled in the area to be addressed.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: March 13, 1990
    Inventor: Norman Lederman