Granted Patent
Utility
US 5,627,249 · App. 08/363,268
Acrylamide polymers and use thereof
Inventors:
Hirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe
Patented Case
View Patent ↗
Granted: May 6, 1997
Filed: Dec 23, 1994
Inventors
Hirotoshi Doki
Hitoshi Ishigaki
Toshiki Oyanagi
Tsugio Matsubara
Shigeo Watanabe
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.