Granted Patent
Utility
US 6,746,639 · App. 09/953,077
Process for preparing polyimide film
Inventors:
Katsunori Yabuta, Kiyokazu Akahori
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Sep 11, 2001
Inventors
Katsunori Yabuta
Kiyokazu Akahori
Assignee (at issue)
KANEKA 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.