Granted Patent
Utility
US 5,326,395 · App. 07/971,615
Silica products
Inventors:
Derek Aldcroft, Ian P. McKeown, Bryan David Rogers, Peter W. Stanier
Patented Case
View Patent ↗
Granted: Jul 5, 1994
Filed: Nov 6, 1992
Inventors
Derek Aldcroft
Ian P. McKeown
Bryan David Rogers
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.