Granted Patent
Utility
US 5,215,733 · App. 07/642,568
Manufacture of silica gels using shear to reduce the particle size prior to washing with a hydrocyclone
Inventor:
John Potter
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jan 18, 1991
Inventor
John Potter
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.