Granted Patent
Utility
US 6,011,647 · App. 08/365,480
Switchable illumination system for a surgical microscope
Inventor:
Otto Geschwentner
Patented Case
View Patent ↗
Granted: Jan 4, 2000
Filed: Dec 28, 1994
Inventor
Otto Geschwentner
Assignee (at issue)
Leica Mikroskopie Systeme AG
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.