Granted Patent
Utility
US 4,828,720 · App. 07/013,340
Liquid separating agent and liquid separating method
Inventors:
Katsuhiko Kuroda, Hideki Yamanouchi
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Feb 11, 1987
Inventors
Katsuhiko Kuroda
Hideki Yamanouchi
Assignee (at issue)
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.