Granted Patent
Utility
US 4,491,530 · App. 06/496,764
Brown stain suppressing phenol free and chlorinated hydrocarbons free photoresist stripper
Inventor:
Evan G. Thomas
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: May 20, 1983
Inventor
Evan G. Thomas
Assignee (at issue)
ALLIED CONSULTING, INC.
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.