Granted Patent
Utility
US 6,022,928 · App. 08/889,011
Method of manufacturing polyelectrolyte from styrene polymers
Inventors:
Yasuhito Inagaki, Tsutomu Noguchi, Haruo Watanabe, Miyuki Kuromiya
Patented Case
View Patent ↗
Granted: Feb 8, 2000
Filed: Jul 7, 1997
Inventors
Yasuhito Inagaki
Tsutomu Noguchi
Haruo Watanabe
Miyuki Kuromiya
Assignee (at issue)
SONY GROUP 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.