Granted Patent
Utility
US 4,953,960 · App. 07/223,968
Optical reduction system
Inventor:
David M. Williamson
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Jul 15, 1988
Inventor
David M. Williamson
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.