Granted Patent
Utility
US 4,263,171 · App. 06/063,111
Polymerization catalyst
Inventors:
Mitsuzo Shida, Thomas J. Pullukat, Raymond E. Hoff
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Aug 1, 1979
Inventors
Mitsuzo Shida
Thomas J. Pullukat
Raymond E. Hoff
Assignee (at issue)
Chemplex, Ltd.
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.