Granted Patent
Utility
US 4,840,701 · App. 07/210,333
Etching apparatus and method
Inventor:
Ronald C. Stern
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jun 23, 1988
Inventor
Ronald C. Stern
Assignee (at issue)
STC PLC
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.