Granted Patent
Utility
US 5,357,576 · App. 08/112,278
In the canal hearing aid with protruding shell portion
Inventor:
Horst Arndt
Patented Case
View Patent ↗
Granted: Oct 18, 1994
Filed: Aug 27, 1993
Inventor
Horst Arndt
Assignee (at issue)
Unitron Industries Ltd.
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.