Granted Patent
Utility
US 5,624,652 · App. 08/424,453
Silicas
Inventors:
Derek Aldcroft, Peter W. Stanier
Patented Case
View Patent ↗
Granted: Apr 29, 1997
Filed: Jun 1, 1995
Inventors
Derek Aldcroft
Peter W. Stanier
Assignee (at issue)
Crosfield Limited
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.