Granted Patent
Utility
US 4,468,257 · App. 06/389,764
Washing and removal method of high molecular substances
Inventors:
Masahiro Kaneko, Tadashi Asanuma, Nobutaka Uchikawa, Ichiro Fujio, Tetsunosuke Shiomura
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Jun 18, 1982
Inventors
Masahiro Kaneko
Tadashi Asanuma
Nobutaka Uchikawa
Ichiro Fujio
Tetsunosuke Shiomura
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.