Granted Patent
Utility
US 4,790,752 · App. 07/115,668
Illuminated dental impression tray
Inventor:
Leonard W. Cheslak
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Nov 2, 1987
Inventor
Leonard W. Cheslak
Assignee (at issue)
Poly-Optical Products, 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.