Hitachi Software Engineering of Kanagawa, Japan, has received US Patent No. 6,818,400, “Process for producing biochip.” The invention aims at producing a biochip by an inkjet system without wasting a DNA solution. A biochip-producing solution is prepared to contain a combination of a DNA solution to be spotted on a plate and a low-cost buffer solution to be remained in the device after the production. The buffer solution used has a different specific gravity from that of the DNA solution and thus is not mixed with the DNA solution.

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