Granted Patent
Utility
US 4,818,785 · App. 06/948,362
Fine particulate crosslinked amorphous copolymer and preparation and use thereof
Inventors:
Yasuhiko Otawa, Tetsuo Tojo, Akira Matsuda, Katsuo Okamoto
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Dec 9, 1986
Inventors
Yasuhiko Otawa
Tetsuo Tojo
Akira Matsuda
Katsuo Okamoto
Assignee (at issue)
Mitsui Petrochemical Industries, 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.