Granted Patent
Utility
US 6,344,584 · App. 09/785,846
Process for producing styrene sulfonate cation
Inventors:
Juchui Ray Lin, Leon Mir, Yongchang Zheng
Patented Case
View Patent ↗
Granted: Feb 5, 2002
Filed: Feb 16, 2001
Inventors
Juchui Ray Lin
Leon Mir
Yongchang Zheng
Assignee (at issue)
Ionics, Incorporated
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.