Granted Patent
Utility
US 4,370,464 · App. 06/315,930
Cationic polymer flocculant
Inventors:
Katsutoshi Tanaka, Hisao Takeda, Mutsumi Kawano, Isao Miyahara
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Oct 28, 1981
Inventors
Katsutoshi Tanaka
Hisao Takeda
Mutsumi Kawano
Isao Miyahara
Assignees (at issue)
Kyoritsu Yuki Co., Ltd.
Mitsubishi Chemical 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.