Granted Patent
Utility
US 5,631,377 · App. 08/450,150
Polyimide intermediates
Inventors:
Mitsunori Matsuo, Tsutomu Ishida, Akio Karasawa, Keizaburo Yamaguchi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: May 26, 1995
Inventors
Mitsunori Matsuo
Tsutomu Ishida
Akio Karasawa
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.