Granted Patent
Utility
US 4,421,483 · App. 06/240,486
Delivery system for dental instruments or the like
Inventors:
Helmut Pietschmann, Manfred Schmidt, Emil Hirth
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Mar 4, 1981
Inventors
Helmut Pietschmann
Manfred Schmidt
Emil Hirth
Assignee (at issue)
Sybron Corporation
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.