Granted Patent
Utility
US 4,412,950 · App. 06/361,187
Monoazo and disazo colorants
Inventor:
Nathan N. Crounse
Patented Case
View Patent ↗
Granted: Nov 1, 1983
Filed: Mar 24, 1982
Inventor
Nathan N. Crounse
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.