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US 4,283,198 AGranted
Inert atmosphere indigo dyeing
OwnerJohn M. Fletcherinventor
Life of this patent
Estimating the term…
Abstract
Oxidation in a leuco indigo dyebath is decreased by enclosing the air-liquor interface whereby enclosed air is depleted of oxygen by the dyebath components.
Claims5
In the continuous process of dyeing cellulosic fibers with indigo wherein said fibers are passed through a train of dip vats each having a squeeze roll assembly and bath liquor comprising leuco indigo, sodium hydrosulfite and sodium hydroxide, the improvement wherein at least a part of the air-liquor interface is enclosed whereby enclosed air is depleted of oxygen by reaction with the components of the bath liquor.
Dependencies are inferred from the claim text.