Granted Patent
Utility
US 5,206,706 · App. 07/723,580
Alignment of an ellipsometer or other optical instrument using a diffraction grating
Inventor:
William E. Quinn
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Jul 1, 1991
Inventor
William E. Quinn
Assignee (at issue)
Bell Communications Research, Inc.
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.