Granted Patent
Utility
US 6,134,331 · App. 08/793,622
Electronic stethoscope
Inventor:
Knud Erik B.ae butted.kgaard
Patented Case
View Patent ↗
Granted: Oct 17, 2000
Filed: Feb 28, 1997
Inventor
Knud Erik B.ae butted.kgaard
Assignee (at issue)
Bang & Olufsen Technology A/S
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.