Granted Patent
Utility
US 4,380,490 · App. 06/248,549
Method of preparing semiconductor surfaces
Inventors:
David E. Aspnes, Ambrose A. Studna
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Mar 27, 1981
Inventors
David E. Aspnes
Ambrose A. Studna
Assignee (at issue)
Bell Telephone Laboratories, 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.