The Zadig v. Baldwin case in 1896 revolved around a dispute over patent rights. The plaintiff, Zadig, claimed that the defendant, Baldwin, had infringed on his patented invention of an improved machine for making paper boxes. However, the Supreme Court ruled against Zadig's claim stating that he was not entitled to any relief as there was no novelty in his alleged invention and thus it did not meet the criteria for patentability under U.S law. The court found that all elements of Zadig’s design were already known or used by others before him; therefore he could not claim exclusive rights over them through a patent.

The dissenting opinion in the case of Zadig v. Baldwin, 1896 is not readily available or well-documented in legal records. This could be due to the age of the case and limitations on record-keeping at that time. It's also possible that there was no formal dissent filed for this particular decision. Without specific information about a dissenting opinion, it's impossible to provide an accurate summary for this request.