Granted Patent
Utility
US 4,915,747 · App. 07/214,857
Aluminum-lithium alloys and process therefor
Inventor:
Chul W. Cho
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Jul 1, 1988
Inventor
Chul W. Cho
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.