Granted Patent
Utility
US 4,416,625 · App. 06/124,842
Orthodontic spring force adjustment and disconnectible connection
Inventor:
Maclay M. Armstrong
Patented Case
View Patent ↗
Granted: Nov 22, 1983
Filed: Feb 26, 1980
Inventor
Maclay M. Armstrong
Assignee (at issue)
Northwest Orthodontics, 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.