Granted Patent
Utility
US 6,744,897 · App. 09/448,362
Hearing aid
Inventor:
André Vonlanthen
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Nov 23, 1999
Inventor
André Vonlanthen
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.