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US 4,961,749 AGranted
Process for removing permanganate stains from articles
AssigneeP.B. & S. Chemical Company, Inc.
InventorJames L. Clements
Life of this patent
Estimating the term…
Abstract
A process for bleaching articles, such as fabrics, comprising the steps of treating an article with a permanganate bleaching agent and then reducing the permanganate with a reducing composition comprised of ammonium bisulfite and ammonium sulfite.
Claims10
A bleaching process comprising the steps of:
- (a) treating a fiber, a fabric or garment with a permanganate bleaching agent;
- and
- (b) reducing the permanganate with a reducing composition containing sulfur dioxide and ammonia at a weight percent ratio in the range of about 3.1:1 to about 3.65:1.
A bleaching process comprising the steps of:
- (a) treating a fiber, fabric or garment with potassium permanganate;
- and
- (b) reducing the permanganate with a reducing composition containing sulfur dioxide and ammonia at a weight percent ratio in the range of about 3.1:1 to about 3.65:1.
Dependencies are inferred from the claim text.