Granted Patent
Utility
US 5,137,446 · App. 07/711,936
Orthodontic implement controllable of correction force
Inventors:
Kiyoshi Yamauchi, Naoharu Yamamoto
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Jun 7, 1991
Inventors
Kiyoshi Yamauchi
Naoharu Yamamoto
Assignee (at issue)
Tokin Corporation and Tomy, Inc.
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.