Granted Patent
Utility
US 4,178,438 · App. 05/941,823
Cationically modified, cellulose-containing materials
Inventors:
Jaroslav Haase, Peter Liechti, Hans Wegmuller, Rudolf F. Wurster, Quentin Bowes
Patented Case
View Patent ↗
Granted: Dec 11, 1979
Filed: Sep 11, 1978
Inventors
Jaroslav Haase
Peter Liechti
Hans Wegmuller
Rudolf F. Wurster
Quentin Bowes
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.