Granted Patent
Utility
US 4,529,682 · App. 06/403,935
Positive photoresist composition with cresol-formaldehyde novolak resins
Inventor:
Medhat A. Toukhy
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Aug 2, 1982
Inventor
Medhat A. Toukhy
Assignee (at issue)
Philip A. Hunt Chemical 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.