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Canon of Tokyo has received US Patent No. 7,827,982, "Ejection liquid and ejection method." The patent describes a method of ejecting a liquid from an inkjet printer, where the liquid contains proteins, peptides, a benzalkonium chloride, and a liquid medium containing water. The patent also claims a liquid-ejection device that includes a liquid-ejection head for ejecting a liquid by a thermal inkjet system, a tank for holding a liquid, and a liquid-feeding path for supplying the liquid held in the tank to the liquid-ejection head.

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