Granted Patent
Utility
US 5,292,821 · App. 08/082,773
Catonic acrylamide polymers and the applications of these polymers
Inventors:
Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
Patented Case
View Patent ↗
Granted: Mar 8, 1994
Filed: Jun 28, 1993
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.