Granted Patent
Utility
US 4,711,535 · App. 06/732,764
Ring field projection system
Inventor:
David Shafer
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: May 10, 1985
Inventor
David Shafer
Assignee (at issue)
PerkinElmer, 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.