Granted Patent
Utility
US 4,246,670 · App. 06/058,045
Process for improving the color yield and fastness properties of dyeings produced with anionic dyes on cellulose fibre material and cationic fibre-reactive compounds
Inventors:
Pierre Perrin, Gert Hegar, Gerald Siegrist, Herbert Seiler, Ulrich Horn
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jul 16, 1979
Inventors
Pierre Perrin
Gert Hegar
Gerald Siegrist
Herbert Seiler
Ulrich Horn
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.