Granted Patent
Utility
US 5,886,220 · App. 08/793,600
Process for preventing polymerization of vinyl compound
Inventors:
Kenji Okamoto, Takashi Nakagawa, Hideaki Mimaki, Kouji Tomita
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Mar 5, 1997
Inventors
Kenji Okamoto
Takashi Nakagawa
Hideaki Mimaki
Kouji Tomita
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.