Granted Patent
Utility
US 4,349,420 · App. 06/224,280
Fractional distillation process for the production of aluminum chloride
Inventor:
Donald L. Stewart, Jr.
Patented Case
View Patent ↗
Granted: Sep 14, 1982
Filed: Jan 12, 1981
Inventor
Donald L. Stewart, Jr.
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.