Granted Patent
Utility
US 5,340,559 · App. 07/908,707
Granular alkali metal silicate production
Inventors:
Francois Delwel, Theo Jan Osinga, Joseph Pierre H. Theunissen, Jack M. Vrancken
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Jul 2, 1992
Inventors
Francois Delwel
Theo Jan Osinga
Joseph Pierre H. Theunissen
Jack M. Vrancken
Assignee (at issue)
Unilever Patent Holdings B.V.
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.