Granted Patent
Utility
US 4,402,669 · App. 06/078,686
Orthodontic safety headgear
Inventor:
Paul D. Frazier
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Sep 25, 1979
Inventor
Paul D. Frazier
Assignee (at issue)
Northwest Orthodontics, 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.