Granted Patent
Utility
US 5,286,840 · App. 07/795,750
Thermally stable polyimide and preparation process of polyimide
Inventors:
Hideaki Oikawa, Nobuhito Koga, Akihiro Yamaguchi, Shoji Tamai
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Nov 21, 1991
Inventors
Hideaki Oikawa
Nobuhito Koga
Akihiro Yamaguchi
Shoji Tamai
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.