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Agilent Technologies of Palo Alto, Calif., has received US Patent No. 6,841,663, “Chemical arrays.” The patent covers methods, apparatus, and computer program products to form arrays of polymers each having a pattern of features on a surface of a flexible elongated web. Polymers or their precursor units are applied at an application station to the surface. Multiple features are covered at a reagent station with a continuous volume of reagent, which chemically reacts with precursors or the web.

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