Granted Patent
Utility
US 4,022,628 · App. 05/610,608
Ion exchange-strengthened silicate glass filter for ultraviolet light
Inventor:
Emil W. Deeg
Patented Case
View Patent ↗
Granted: May 10, 1977
Filed: Sep 5, 1975
Inventor
Emil W. Deeg
Assignee (at issue)
American Optical 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.