Inventions [1] and [2] are related as mutually exclusive species in an intermediate-final product relationship. Distinctness is proven for claims in this relationship if the intermediate product is useful to make other than the final product and the species are patentably distinct ( MPEP § 806.05(j) ). In the instant case, the intermediate product is deemed to be useful as [3] and the inventions are deemed patentably distinct because there is nothing of record to show them to be obvious variants.