Granted Patent
Utility
US 6,071,999 · App. 09/033,237
Process for preparing styrenic resin
Inventors:
Tsutomu Onodera, Kazuyoshi Fukada, Takashi Saeki
Patented Case
View Patent ↗
Granted: Jun 6, 2000
Filed: Mar 3, 1998
Inventors
Tsutomu Onodera
Kazuyoshi Fukada
Takashi Saeki
Assignee (at issue)
Idemitsu Petrochemical 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.