Granted Patent
Utility
US 4,831,068 · App. 07/156,640
Process for improving the photochemical stability of dyeings on polyester fibre materials
Inventors:
Gerhard Reinert, Kurt Burdeska
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Feb 17, 1988
Inventors
Gerhard Reinert
Kurt Burdeska
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.