Granted Patent
Utility
US 5,346,808 · App. 08/148,235
Positive image formation utilizing o-quinonediazide composition including selected phenolic derivatives of 4-(4-hydroxyphenyl)-cyclohexanone
Inventor:
Alfred T. Jeffries, III
Patented Case
View Patent ↗
Granted: Sep 13, 1994
Filed: Nov 8, 1993
Inventor
Alfred T. Jeffries, III
Assignee (at issue)
OCG Microelectronic Materials, 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.