Granted Patent
Utility
US 4,744,834 · App. 06/857,841
Photoresist stripper comprising a pyrrolidinone, a diethylene glycol ether, a polyglycol and a quaternary ammonium hydroxide
Inventor:
Noor Haq
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: Apr 30, 1986
Inventor
Noor Haq
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.