Granted Patent
Utility
US 6,187,899 · App. 09/257,234
Polyamic acid and polyimide microfine particles and process for their production
Inventors:
Katsuya Asao, Hidenori Saito
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Feb 25, 1999
Inventors
Katsuya Asao
Hidenori Saito
Assignees (at issue)
Osaka Prefectural Government
Sumitomo Bekelite 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.