| http://www.w3.org/ns/prov#value | - Cir. 2009), as well as when it contains language that is essential to the description of the invention, see In re Bulloch, 604 F.2d 1362, 1365 (CCPA 1979) (The introductory claim language 'stable color developer concentrate' is more than a mere statement of purpose; and that language is essential to particularly point out the invention defined by the claims.).
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