Granted Patent
Utility
US 5,200,537 · App. 07/923,646
Process for preparing metallocenes
Inventors:
John Y. Lee, Steven P. Diefenbach
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Aug 3, 1992
Inventors
John Y. Lee
Steven P. Diefenbach
Assignee (at issue)
Ethyl 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.