Granted Patent
Utility
US 5,206,348 · App. 07/919,357
Hexahydroxybenzophenone sulfonate esters of diazonaphthoquinone sensitizers and positive photoresists employing same
Inventors:
Elaine C. Jacovich, Wells Cunningham
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Jul 23, 1992
Inventors
Elaine C. Jacovich
Wells Cunningham
Assignee (at issue)
Morton International, 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.