Granted Patent
Utility
US 5,643,624 · App. 08/563,748
Amorphous silicas
Inventors:
Derek Aldcroft, John R. Newton, Peter W. Stanier
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Nov 29, 1995
Inventors
Derek Aldcroft
John R. Newton
Peter W. Stanier
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.