Granted Patent
Utility
US 4,675,444 · App. 06/802,182
Process for producing aminophenols
Inventors:
Fujihisa Matsunaga, Eiji Kato, Tsuyoshi Kimura, Yoichiro Isota
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Nov 25, 1985
Inventors
Fujihisa Matsunaga
Eiji Kato
Tsuyoshi Kimura
Yoichiro Isota
Assignees (at issue)
Mitsu Petrochemical Ind., Ltd.
Honshu Chemical Ind. 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.