Granted Patent
Utility
US 6,267,589 · App. 09/444,329
Orthodontic screw expansion device
Inventors:
Farrokh Farzin-Nia, Craig A. Andreiko
Patented Case
View Patent ↗
Granted: Jul 31, 2001
Filed: Nov 19, 1999
Inventors
Farrokh Farzin-Nia
Craig A. Andreiko
Assignee (at issue)
Ormco 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.