Granted Patent
Utility
US 6,774,984 · App. 10/145,138
Optical imaging system with polarizer and a crystalline-quartz plate for use therewith
Inventor:
Michael Gerhard
Patented Case
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Granted: Aug 10, 2004
Filed: May 15, 2002
Inventor
Michael Gerhard
Assignee (at issue)
Carl Zeiss Semiconductor Manufacturing Technologies 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.