Granted Patent
Utility
US 4,520,236 · App. 06/556,604
Sound transfer from a hearing aid to the human ear drum
Inventor:
Edouard A. Gauthier
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Nov 30, 1983
Inventor
Edouard A. Gauthier
Assignee (at issue)
Nu-Bar Electronics
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.