Granted Patent
Utility
US 5,447,704 · App. 08/158,818
Amorphous silica
Inventors:
Derek Aldcroft, John R. Newton, James P. Quinn, Peter W. Stainier
Patented Case
View Patent ↗
Granted: Sep 5, 1995
Filed: Nov 29, 1993
Inventors
Derek Aldcroft
John R. Newton
James P. Quinn
Peter W. Stainier
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.