Granted Patent
Utility
US 6,262,201 · App. 09/334,852
Aryl substituted metallocene catalysts and their use
Inventors:
M. Bruce Welch, Erik Licht, Helmut G. Alt
Patented Case
View Patent ↗
Granted: Jul 17, 2001
Filed: Jun 17, 1999
Inventors
M. Bruce Welch
Erik Licht
Helmut G. Alt
Assignee (at issue)
Phillips Petroleum Company
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.