Patents by Inventor Joel Anders Rehde

Joel Anders Rehde 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).

  • Loudspeaker
    Patent number: 4100992
    Abstract: A loudspeaker including a porous diaphragm having an outside edge, an electromagnetic drive means mounted on a central area of the diaphragm for displacing the diaphragm and a hard ring forming a junction between the diaphragm and the drive means with the diaphragm being totally permeated with a stiffening material in the area between the ring and the outer edge without increasing the thickness of the diaphragm thereby improving the acoustic characteristics of the loudspeaker as compared with an equivalent unstiffened diaphragm.
    Type: Grant
    Filed: March 28, 1977
    Date of Patent: July 18, 1978
    Inventors: Weber Louis Rehde, Joel Anders Rehde