Granted Patent
Utility
US 4,908,409 · App. 07/119,042
Polyimide
Inventors:
Hideaki Oikawa, Katsuaki Liyama, Nobuhito Koga, Saburo Kawashima, Shoji Tamai, Masahiro Ohta, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Nov 10, 1987
Inventors
Hideaki Oikawa
Katsuaki Liyama
Nobuhito Koga
Saburo Kawashima
Shoji Tamai
Masahiro Ohta
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.