Granted Patent
Utility
US 6,160,897 · App. 09/307,909
Apparatus for operation in an on-ear mode and an off-ear mode
Inventor:
Erich Klein
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: May 11, 1999
Inventor
Erich Klein
Assignee (at issue)
U.S. Philips Corporation
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.