Granted Patent
Utility
US 4,588,412 · App. 06/681,990
Solid formulations of dyes which are sparingly soluble or insoluble in water
Inventor:
Paul Hugelshofer
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Dec 14, 1984
Inventor
Paul Hugelshofer
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.