Granted Patent
Utility
US 4,390,650 · App. 06/301,569
Process for making fibrous material water repellent
Inventors:
Hans Deiner, Willy Bernheim
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Sep 14, 1981
Inventors
Hans Deiner
Willy Bernheim
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.