Patents by Inventor Nils-Erik Agneus

Nils-Erik Agneus 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).

  • Temperature-stable electret microphone with embossed, small area, electret
    Patent number: 4142073
    Abstract: Temperature-stable electret microphone with a metallized plastic film stretched over a polarized plastic film and fastened to an underlying fixed electrode, the polarized plastic film being on at least one side embossed with a relief pattern, having a smaller area than the underlying fixed electrode and being concentrically fixed to this by the metallized plastic film.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: February 27, 1979
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Nils-Erik Agneus, Hans-Eric Mansson