Granted Patent
Utility
US 4,818,248 · App. 07/102,942
Process for dyeing natural or synthetic polyamide fibre materials with 1:1 metal complex dyes in presence of alkali metal fluordsilicate or amindnlum silicate
Inventors:
Gerhard Back, Walter Mosimann
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Sep 30, 1987
Inventors
Gerhard Back
Walter Mosimann
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.