Granted Patent
Utility
US 4,540,510 · App. 06/579,242
Synergistic thickener mixtures of amps polymers with other thickeners
Inventor:
Curtis L. Karl
Patented Case
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Granted: Sep 10, 1985
Filed: Feb 13, 1984
Inventor
Curtis L. Karl
Assignee (at issue)
Henkel Limited
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.