Granted Patent
Utility
US 6,663,575 · App. 09/938,534
Device for electromechanical stimulation and testing of hearing
Inventor:
Hans Leysieffer
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Aug 27, 2001
Inventor
Hans Leysieffer
Assignee (at issue)
Phonak AG
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.