Granted Patent
Utility
US 5,955,539 · App. 09/013,262
Cyanoethyl group-containing graft polymer
Inventor:
Satoshi Nishikawa
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Jan 26, 1998
Inventor
Satoshi Nishikawa
Assignees (at issue)
Sunstar Giken Kabushiki Kaisha
Uni-Sunstar B.V.
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.