Granted Patent
Utility
US 5,406,461 · App. 07/838,399
Illumination system for optical equipment with separate illuminating beam paths
Inventor:
Bernd AMANN
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Feb 18, 1992
Inventor
Bernd AMANN
Assignee (at issue)
Leica Heerbrugg AG (Schweiz)
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.