Granted Patent
Utility
US 5,622,494 · App. 08/391,663
Plastic orthodontic appliance having a mechanical bonding base and method of making same
Inventors:
Craig A. Andreiko, David L. Ludwig
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Feb 21, 1995
Inventors
Craig A. Andreiko
David L. Ludwig
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.