Granted Patent
Utility
US 6,177,375 · App. 09/037,138
High activity olefin polymerization catalysts
Inventors:
Thomas J. Pullukat, Ronald S. Shinomoto
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Mar 9, 1998
Inventors
Thomas J. Pullukat
Ronald S. Shinomoto
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.