Granted Patent
Utility
US 5,895,770 · App. 08/822,453
Olefin polymerization catalysts with specific silica supports
Inventors:
Thomas J. Pullukat, Carl A. Gillings, Reinhard Witt
Patented Case
View Patent ↗
Granted: Apr 20, 1999
Filed: Mar 21, 1997
Inventors
Thomas J. Pullukat
Carl A. Gillings
Reinhard Witt
Assignee (at issue)
PQ Corporation
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.