Granted Patent
Utility
US 5,451,648 · App. 08/364,728
Process for producing styrenic polymer
Inventors:
Satoshi Ikeuchi, Norio Tomotsu
Patented Case
View Patent ↗
Granted: Sep 19, 1995
Filed: Dec 27, 1994
Inventors
Satoshi Ikeuchi
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.