Granted Patent
Utility
US 4,217,272 · App. 05/949,871
Novel monoazo and disazo colorants from aminoalkylanilines and bis(aminoalkyl)anilines
Inventor:
Nathan N. Crounse
Patented Case
View Patent ↗
Granted: Aug 12, 1980
Filed: Oct 10, 1978
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.