Granted Patent
Utility
US 4,937,316 · App. 07/313,732
Process for preparing polyimides
Inventors:
Masahiro Ohta, Saburo Kawashima, Katsuaki Iiyama, Shoji Tamai, Hideaki Oikawa, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Feb 22, 1989
Inventors
Masahiro Ohta
Saburo Kawashima
Katsuaki Iiyama
Shoji Tamai
Hideaki Oikawa
Akihiro Yamaguchi
Assignee (at issue)
Amdahl Corporation
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.