Granted Patent
Utility
US 5,668,229 · App. 08/747,269
Process for preparing high-molecular weight acrylamide polymer
Inventors:
Takashi Abe, Hiroshi Itoh, Manabu Tsuruta, Shoko Oyanagi, Kenichi Nakamura
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Nov 12, 1996
Inventors
Takashi Abe
Hiroshi Itoh
Manabu Tsuruta
Shoko Oyanagi
Kenichi Nakamura
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.