Granted Patent
Utility
US 5,294,685 · App. 08/079,860
Process for producing a styrenic polymer having a high degree of syndiotacticity
Inventors:
Masami Watanabe, Shoji Naganuma, Norio Tomotsu
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: Jun 22, 1993
Inventors
Masami Watanabe
Shoji Naganuma
Norio Tomotsu
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.