Granted Patent
Utility
US 4,401,691 · App. 05/970,580
Oxidation of silicon wafers to eliminate white ribbon
Inventor:
William C. Young
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Dec 18, 1978
Inventor
William C. Young
Assignee (at issue)
Burroughs, 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.