Granted Patent
Utility
US 6,648,644 · App. 09/936,163
Subgingival treatment by powder jet
Inventors:
Thomas Flemmig, Bernd Gangnus, Oswald Gasser, Rainer Guggenberger
Patented Case
View Patent ↗
Granted: Nov 18, 2003
Filed: Oct 18, 2001
Inventors
Thomas Flemmig
Bernd Gangnus
Oswald Gasser
Rainer Guggenberger
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.