Patent No. US 6,736,857 B2: Research-ers for 3M Innovative Properties Co., St. Paul, MN, earned a patent for a carpet cleaner imparting soil and stain resistance, which comprises water, a stainblocker from copolymers of methacrylic acid and butyl acrylate, a silsesquioxane and a surfactant. It requires vacuum removal.
Stain-Resistant Carpet Cleaner Developed by 3M
Published November 15, 2005
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