Granted Patent
Utility
US 5,190,702 · App. 07/756,788
Method of making a mold for manufacturing dental appliances
Inventor:
William B. Johnson
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Sep 9, 1991
Inventor
William B. Johnson
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.