Patents by Inventor Robert Francois Coehorst

Robert Francois Coehorst 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).

  • Earpiece which substantially consists of a thin-walled flexible capsule filled with a liquid medium
    Patent number: 4006796
    Abstract: An earpiece which takes the form of a pouch made of a plastics foil which surrounds a less pliant plastics tube in an airtight manner and is filled with a sluggishly moving jelly-like paste.A not readily movable compression ring provided with a funnel shaped portion which is clear of the tube ensures that the pouch is filled in such a way that during use the pouch perfectly engages with the inner wall of the auditory canal.
    Type: Grant
    Filed: December 16, 1974
    Date of Patent: February 8, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Robert Francois Coehorst