Granted Patent
Utility
US 5,221,207 · App. 07/769,433
Yellow dental alloy with a high gold content
Inventors:
Gernot Schoeck, Bernd Kempf, Werner Groll
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Oct 2, 1991
Inventors
Gernot Schoeck
Bernd Kempf
Werner Groll
Assignee (at issue)
Degussa 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.