Granted Patent
Utility
US 5,286,470 · App. 07/775,930
Silicate products
Inventor:
Francois Delwel
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Dec 31, 1991
Inventor
Francois Delwel
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.