Granted Patent
Utility
US 4,933,401 · App. 07/314,130
Catalyst composition for polymerization of conjugated diene and process for producing conjugated diene polymer
Inventors:
Iwakazu Hattori, Noboru Shimada, Noboru Oshima, Mitsuhiko Sakakibara
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Feb 23, 1989
Inventors
Iwakazu Hattori
Noboru Shimada
Noboru Oshima
Mitsuhiko Sakakibara
Assignee (at issue)
Japan Synthetic Rubber 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.