Granted Patent
Utility
US 4,752,298 · App. 06/931,387
Storage-stable formulations of water-insoluble or sparingly water-soluble dyes with electrolyte-sensitive thickeners: polyacrylic acid
Inventors:
Marc Burglin, Roland Putzar
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Nov 17, 1986
Inventors
Marc Burglin
Roland Putzar
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.