Granted Patent
Utility
US 4,535,131 · App. 06/596,102
Process for producing partially hydrolyzed acrylamide polymer
Inventors:
Ryoji Handa, Jun Hosoda, Norimasa Yoshida
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Apr 2, 1984
Inventors
Ryoji Handa
Jun Hosoda
Norimasa Yoshida
Assignees (at issue)
Nitto Kagaku Kabushiki Kaisha
MITSUBISHI ELECTRIC CORPORATION
Diafloc Co., 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.