Granted Patent
Utility
US 6,389,142 · App. 09/052,631
In-the-ear hearing aid with directional microphone system
Inventors:
Lawrence T. Hagen, David A. Preves
Patented Case
View Patent ↗
Granted: May 14, 2002
Filed: Mar 31, 1998
Inventors
Lawrence T. Hagen
David A. Preves
Assignee (at issue)
Micro Ear Technology, 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.