Granted Patent
Utility
US 5,212,593 · App. 07/831,818
Broad band optical reduction system using matched multiple refractive element materials
Inventors:
David M. Williamson, Satish Desai
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Feb 6, 1992
Inventors
David M. Williamson
Satish Desai
Assignee (at issue)
SVG Lithography Systems, 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.