Granted Patent
Utility
US 5,354,890 · App. 08/080,772
Aromatic diamine intermediates useful in the preparation of polyimides
Inventors:
Shoji Tamai, Wataru Yamashita, Yuichi Okawa, Yuko Ishihara, Keizaburo Yamaguchi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Jun 24, 1993
Inventors
Shoji Tamai
Wataru Yamashita
Yuichi Okawa
Yuko Ishihara
Keizaburo Yamaguchi
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.