Granted Patent
Utility
US 4,874,734 · App. 07/174,967
Process for producing solid catalyst for polymerization of olefins
Inventors:
Mamoru Kioka, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Mar 29, 1988
Inventors
Mamoru Kioka
Norio Kashiwa
Assignee (at issue)
Mitsui Petrochemical Industries, 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.