Granted Patent
Utility
US 5,670,587 · App. 08/537,868
Catalyst for producing aromatic vinyl compound-based polymer composition and process for producing aromatic vinyl compound-based polymer composition using same
Inventors:
Mizutomo Takeuchi, Hajime Shouzaki, Norio Tomotsu, Masahiko Kuramoto
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Jan 23, 1996
Inventors
Mizutomo Takeuchi
Hajime Shouzaki
Norio Tomotsu
Masahiko Kuramoto
Assignee (at issue)
IDEMITSU KOSAN CO., 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.