Granted Patent
Utility
US 6,407,148 · App. 09/554,442
Metal-free dental filling system as a substitute for amalgam
Inventors:
Daniela Krejci, Ivo KREJCI, Felix Lutz
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: May 15, 2000
Inventors
Daniela Krejci
Ivo KREJCI
Felix Lutz
Assignee (at issue)
3M ESPE AG
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.