Granted Patent
Utility
US 4,875,920 · App. 07/128,676
Ion-exchangeable phosphate glass compositions and strengthened optical quality glass articles
Inventor:
John D. Myers
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Dec 4, 1987
Inventor
John D. Myers
Assignee (at issue)
Kigre, 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.