Granted Patent
Utility
US 4,772,687 · App. 06/858,404
Metal complex dyestuffs useful as solvent, direct, pigment or fiber-reactive dyes
Inventor:
Hermann Henk
Patented Case
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Granted: Sep 20, 1988
Filed: May 1, 1986
Inventor
Hermann Henk
Assignee (at issue)
Bayer Aktiengesellschaft
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.