Granted Patent
Utility
US 4,411,665 · App. 06/277,860
Dyeing process using alkoxylated fatty amines and polyamines as reserving agents
Inventors:
Hermann Egli, Emil Engeler
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: Jun 26, 1981
Inventors
Hermann Egli
Emil Engeler
Assignee (at issue)
Sandoz AG
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.