Granted Patent
Utility
US 5,372,874 · App. 08/139,327
DC reactively sputtered optical coatings including niobium oxide
Inventors:
Eric R. Dickey, Debra M. Steffenhagen
Patented Case
View Patent ↗
Granted: Dec 13, 1994
Filed: Oct 19, 1993
Inventors
Eric R. Dickey
Debra M. Steffenhagen
Assignee (at issue)
Viratec Thin Films, 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.