Granted Patent
Utility
US 5,230,619 · App. 07/892,263
Orthodontic appliance with protective porous film
Inventor:
Raymond F. Wong
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Jun 2, 1992
Inventor
Raymond F. Wong
Assignee (at issue)
Ormco Corporation
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.