Granted Patent
Utility
US 4,772,325 · App. 07/044,206
Fluorine-containing dental materials
Inventors:
Stephen C. Kwan, John J. O'Connell
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Apr 30, 1987
Inventors
Stephen C. Kwan
John J. O'Connell
Assignee (at issue)
Kerr Manufacturing Company
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.