Granted Patent
Utility
US 4,275,239 · App. 06/118,133
1,10-Dialkyl-1,10-decamethylenediamines
Inventors:
Josef Pfeifer, Heinz Peter
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Feb 4, 1980
Inventors
Josef Pfeifer
Heinz Peter
Assignee (at issue)
Ciba-Geigy
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.