Granted Patent
Utility
US 4,394,182 · App. 06/311,206
Microelectronic shadow masking process for reducing punchthrough
Inventor:
Roy L. Maddox, III
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Oct 14, 1981
Inventor
Roy L. Maddox, III
Assignee (at issue)
Rockwell International 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.