Granted Patent
Utility
US 4,548,822 · App. 06/606,155
Acid soluble annatto colorant in a powdered form
Inventor:
Thomas Schmidt
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: May 2, 1984
Inventor
Thomas Schmidt
Assignee (at issue)
Miles Laboratories, Inc.
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.