Description: 523 synthetic resins or natural rubbers -- part of the class 520 series / 523 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (1) processes of preparing a desired or intentional composition of at least one nonreactant material and at least one solid polymer or specified intermediate condensation product, or product thereof (105) nonmedicated composition specifically intended for contact with living animal tissue or process of preparing; other than apparel (113) composition suitable for use as tissue or body member replacement, restorative, or implant (115) composition suitable for use as tooth or bone replacement, restorative, or implant
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