Granted Patent
Utility
US 4,242,218 · App. 05/740,154
Phenol-free photoresist stripper
Inventor:
John E. Vander Mey
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Nov 8, 1976
Inventor
John E. Vander Mey
Assignee (at issue)
Allied 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.