Granted Patent
Utility
US 6,121,362 · App. 09/116,255
Silicone-based impression material
Inventors:
Erich Wanek, Joachim W. Zech
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Jul 16, 1998
Inventors
Erich Wanek
Joachim W. Zech
Assignee (at issue)
ESPE Dental 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.