Granted Patent
Utility
US 5,166,188 · App. 07/837,599
Butenoic acid derivatives
Inventors:
Norio Minami, Fumihiro Ozaki, Keiji Ishibashi, Yasuhiro Kabasawa, Toshiaki Ogawa, Hideyuki Adachi, Takanori Kawamura
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Feb 20, 1992
Inventors
Norio Minami
Fumihiro Ozaki
Keiji Ishibashi
Yasuhiro Kabasawa
Toshiaki Ogawa
Hideyuki Adachi
Takanori Kawamura
Assignee (at issue)
Eisai 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.