Granted Patent
Utility
US 6,174,971 · App. 08/789,862
Ziegler-natta catalysts for olefin polymerization
Inventors:
Hong Chen, Tim Coffy, Edwar S. Shamshoum
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Jan 28, 1997
Inventors
Hong Chen
Tim Coffy
Edwar S. Shamshoum
Assignee (at issue)
Fina Technology, Inc.
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.