Granted Patent
Utility
US 6,538,809 · App. 08/232,362
Variable epi-illumination interference attachment
Inventor:
Hans-Werner Stankewitz
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Apr 25, 1994
Inventor
Hans-Werner Stankewitz
Assignee (at issue)
Leica Microsystems Wetzlar 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.