Granted Patent
Utility
US 5,322,962 · App. 08/059,758
Aromatic diamine intermediates useful in the preparation of polyimide
Inventors:
Shoji Tamai, Keizaburo Yamaguchi, Yuko Ishihara, Saburo Kawashima, Hideaki Oikawa, Toshiyuki Kataoka, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: May 12, 1993
Inventors
Shoji Tamai
Keizaburo Yamaguchi
Yuko Ishihara
Saburo Kawashima
Hideaki Oikawa
Toshiyuki Kataoka
Akihiro Yamaguchi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.