Granted Patent
Utility
US 4,447,351 · App. 06/457,547
Preparation of alumina hydrosol from aluminum sulfate solution
Inventor:
Tai-Hsiang Chao
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Jan 12, 1983
Inventor
Tai-Hsiang Chao
Assignee (at issue)
UOP LLC
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.