Granted Patent
Utility
US 4,629,485 · App. 06/535,786
Method of making fluorine doped optical preform and fiber and resultant articles
Inventor:
George E. Berkey
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Sep 26, 1983
Inventor
George E. Berkey
Assignee (at issue)
Corning Glass Works
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.