Granted Patent
Utility
US 4,154,812 · App. 05/781,393
Process for preparing alumina
Inventors:
Moises G. Sanchez, Norman R. Laine
Patented Case
View Patent ↗
Granted: May 15, 1979
Filed: Mar 25, 1977
Inventors
Moises G. Sanchez
Norman R. Laine
Assignee (at issue)
W. R. Grace & Co.
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.