Granted Patent
Utility
US 4,861,391 · App. 07/132,889
Aluminum alloy two-step aging method and article
Inventors:
Roberto J. Rioja, Edward L. Colvin, Asuri K. Vasudevan, Brian A. Cheney
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Dec 14, 1987
Inventors
Roberto J. Rioja
Edward L. Colvin
Asuri K. Vasudevan
Brian A. Cheney
Assignee (at issue)
Aluminum Company of America
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.