Granted Patent
Utility
US 5,239,014 · App. 07/725,611
Cationic acrylamide polymers and the applications of these polymers
Inventors:
Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Jul 3, 1991
Inventors
Toshihiko Takaki
Kenji Tsuboi
Hiroshi Itoh
Atsuhiko Nitta
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.