Granted Patent
Utility
US 6,262,299 · App. 09/348,085
Zwitterionic monomer having amino-multicarboxylic acid functionality
Inventors:
John J. Tsai, Sirisoma Wanigatunga
Patented Case
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Granted: Jul 17, 2001
Filed: Jul 6, 1999
Inventors
John J. Tsai
Sirisoma Wanigatunga
Assignee (at issue)
National Starch and Chemical Investment Holding Copporation
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.