Granted Patent
Utility
US 4,806,174 · App. 06/793,273
Aluminum-lithium alloys and method of making the same
Inventors:
Chul W. Cho, Ralph R. Sawtell
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Nov 19, 1985
Inventors
Chul W. Cho
Ralph R. Sawtell
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.