Granted Patent
Utility
US 5,087,644 · App. 07/480,631
Carbon-fiber-reinforced polyimide resin compositions
Inventors:
Toshihiko Tsutsumi, Toshiyuki Nakakura, Shuichi Morikawa, Nobuhito Koga
Patented Case
View Patent ↗
Granted: Feb 11, 1992
Filed: Feb 15, 1990
Inventors
Toshihiko Tsutsumi
Toshiyuki Nakakura
Shuichi Morikawa
Nobuhito Koga
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.