SMITH, Judge.
On May 9, 1958, appellants filed application serial No. 734,106 for a patent on "Production of Viral Interfering Substances." On this appeal they urge error in the board's decision, adhered to on reconsideration, sustaining the examiner's rejection of all the claims in that application.
The claims, 1-19, define a process and a product produced by the process. Claims 1 and 18 are illustrative and read:
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