Granted Patent
Utility
US 4,401,726 · App. 06/332,964
Metal surface modification
Inventor:
Daniel S. Gnanamuthu
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Dec 21, 1981
Inventor
Daniel S. Gnanamuthu
Assignee (at issue)
AVCO Everett Research Laboratory, 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.