Granted Patent
Utility
US 5,890,072 · App. 08/744,364
Radiotelephone having a non-resonant wave guide acoustically coupled to a microphone
Inventor:
Karl W. Rabe
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Nov 7, 1996
Inventor
Karl W. Rabe
Assignee (at issue)
ERICSSON GMBH
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.