Granted Patent
Utility
US 4,965,167 · App. 07/269,521
Positive-working photoresist employing a selected mixture of ethyl lactate and ethyl 3-ethoxy propionate as casting solvent
Inventor:
Thomas E. Salamy
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Nov 10, 1988
Inventor
Thomas E. Salamy
Assignee (at issue)
Olin Hunt Specialty Products, 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.