Granted Patent
Utility
US 5,868,968 · App. 08/965,195
Polyimide resin compositions for optical filters
Inventors:
Keisuke Takuma, Kazuhiro Seino, Tsutami Misawa, Shoji Tamai, Wataru Yamashita
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Nov 6, 1997
Inventors
Keisuke Takuma
Kazuhiro Seino
Tsutami Misawa
Shoji Tamai
Wataru Yamashita
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.