Granted Patent
Utility
US 5,969,138 · App. 08/961,221
Pyrrolidinone derivatives
Inventors:
Naruyoshi Mita, Hiroshi Nagase, Hajime Iizuka, Takahisa Oguchi, Kazuya Sakai, Kazutoshi Horikomi, Takaichi Miwa, Shinji Takahashi
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Oct 30, 1997
Inventors
Naruyoshi Mita
Hiroshi Nagase
Hajime Iizuka
Takahisa Oguchi
Kazuya Sakai
Kazutoshi Horikomi
Takaichi Miwa
Shinji Takahashi
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.