Granted Patent
Utility
US 4,139,645 · App. 05/823,801
Coloring agents for edible materials
Inventor:
Raymond E. Werner
Patented Case
View Patent ↗
Granted: Feb 13, 1979
Filed: Aug 11, 1977
Inventor
Raymond E. Werner
Assignee (at issue)
Sterling Drug, 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.