Granted Patent
Utility
US 4,431,420 · App. 06/373,617
Glass-ceramic dental products
Inventor:
Peter J. Adair
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Apr 30, 1982
Inventor
Peter J. Adair
Assignee (at issue)
Corning Glass Works
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.