Granted Patent
Utility
US 5,389,203 · App. 08/115,917
Paper-making additives comprising cationic polymers
Inventors:
Shigeru Sawayama, Kohichi Satoh, Shin Sato, Toshiaki Sakakihara
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Sep 1, 1993
Inventors
Shigeru Sawayama
Kohichi Satoh
Shin Sato
Toshiaki Sakakihara
Assignee (at issue)
Mitsubishi Kasei Corporation
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.