Granted Patent
Utility
US 4,920,028 · App. 07/227,404
High contrast high thermal stability positive photoresists with mixed cresol and hydroxybenzaldehyde prepared novolak and photosensitive diazoquinone
Inventors:
Richard M. Lazarus, Randall Kautz, Sunit S. Dixit
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Aug 2, 1988
Inventors
Richard M. Lazarus
Randall Kautz
Sunit S. Dixit
Assignee (at issue)
Morton Thiokol
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.