Granted Patent
Utility
US 4,484,978 · App. 06/535,148
Etching method
Inventor:
Thomas Keyser
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Sep 23, 1983
Inventor
Thomas Keyser
Assignee (at issue)
Fairchild Camera & Instrument Corp.
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.