Granted Patent
Utility
US 4,709,740 · App. 06/850,488
Direct chill casting of aluminum-lithium alloys
Inventors:
John E. Jacoby, Ho Yu, Robert A. Ramser
Patented Case
View Patent ↗
Granted: Dec 1, 1987
Filed: Apr 11, 1986
Inventors
John E. Jacoby
Ho Yu
Robert A. Ramser
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.