Granted Patent
Utility
US 6,655,957 · App. 09/952,578
Self-ligating orthodontic brackets formed from multiple plastic materials
Inventors:
Norbert Abels, Claus H. Backes
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Sep 12, 2001
Inventors
Norbert Abels
Claus H. Backes
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.