Granted Patent
Utility
US 6,625,290 · App. 09/342,407
Behind-the-ear hearing aid
Inventor:
Erich Dittli
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Jun 28, 1999
Inventor
Erich Dittli
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.