Granted Patent
Utility
US 4,957,550 · App. 07/239,320
Ultrasonic machining tool for machining orthodontic brackets
Inventors:
James F. Reher, Farrokh Farzin-Nia
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Sep 1, 1988
Inventors
James F. Reher
Farrokh Farzin-Nia
Assignee (at issue)
Manufacturers Hanover Trust Company
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.