Granted Patent
Utility
US 6,335,418 · App. 09/640,872
Functional polyamic acid microfine particles, functional polyimide microfine particles, and processes for their production
Inventors:
Katsuya Asao, Hitoshi Morita, Hitoshi Onishi, Masaki Kimoto, Yayoi Yoshioka, Hidenori Saito
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Aug 18, 2000
Inventors
Katsuya Asao
Hitoshi Morita
Hitoshi Onishi
Masaki Kimoto
Yayoi Yoshioka
Hidenori Saito
Assignees (at issue)
Osaka Prefectural Government
SUMITOMO BAKELITE CO., LTD.
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.