Granted Patent
Utility
US 4,544,621 · App. 06/492,853
Photocrosslinkable water-soluble polymers, containing maleimidyl and quaternary ammonium groups process for their preparation and use thereof
Inventor:
Martin Roth
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: May 9, 1983
Inventor
Martin Roth
Assignee (at issue)
Ciba-Geigy
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.