Granted Patent
Utility
US 6,545,070 · App. 09/382,949
Composition of ionic substituted polystyrene and stabilizer(s)
Inventors:
Yasuhito Inagaki, Tsutomu Noguchi, Haruo Watanabe, Miyuki Kuromiya
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Aug 25, 1999
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.