Granted Patent
Utility
US 4,304,552 · App. 06/157,613
Dental wrench
Inventors:
David Wright, Walter M. Bailey
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Jun 9, 1980
Inventors
David Wright
Walter M. Bailey
Assignee (at issue)
Syntex (U.S.A.) LLC
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.