Granted Patent
Utility
US 5,201,655 · App. 07/742,179
Optical light guide for controlling the irradiation of a dental restorative material
Inventor:
Joshua Friedman
Patented Case
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Granted: Apr 13, 1993
Filed: Aug 2, 1991
Inventor
Joshua Friedman
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.