NICHOLS, Senior Circuit Judge.
This is an appeal from the decision of the Patent and Trademark Office (PTO) Board of Appeals (board) affirming the examiner's final rejection under 35 U.S.C. § 103 of claims 15-22 of appellant's application serial No. 54,757, filed July 3, 1979, entitled "Herbicidal Esters of 4-Tri-fluoromethyl-3'-carboxy-4'-nitro diphenyl ethers." We affirm.
I
Background
A. The Invention
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