Granted Patent
Utility
US 5,225,229 · App. 07/601,654
Aluminum hydroxide production
Inventors:
Edward S. Martin, Mark L. Weaver, John E. Marhanka, Alan Pearson, Masaki Madono
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Mar 5, 1990
Inventors
Edward S. Martin
Mark L. Weaver
John E. Marhanka
Alan Pearson
Masaki Madono
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.