Granted Patent
Utility
US 5,210,174 · App. 07/612,461
Preparation process of polyimide
Inventors:
Shoji Tamai, Hideaki Oikawa, Masahiro Ohta, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Nov 14, 1990
Inventors
Shoji Tamai
Hideaki Oikawa
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.