Granted Patent
Utility
US 4,377,631 · App. 06/275,883
Positive novolak photoresist compositions
Inventors:
Medhat A. Toukhy, Leo Klawansky
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Jun 22, 1981
Inventors
Medhat A. Toukhy
Leo Klawansky
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.