Granted Patent
Utility
US 6,217,508 · App. 09/133,961
Ultrasonic hearing system
Inventors:
Geoffrey R. Ball, Bob H. Katz
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Aug 14, 1998
Inventors
Geoffrey R. Ball
Bob H. Katz
Assignee (at issue)
Symphonix Devices, Inc.
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.