添附、看作、專利進步性（下）

American property law scholars, such as Merrill and Smith, have proposed inspiring studies of the doctrine of accession as a general principle of property law. This article examines patent laws nonobviousness requirement in terms of accession. Accession is a process of searching for the fit manager of resources. In assigning the initial entitlement, accession often uses proxy measurement. The Civil Laws provisions on accession (Articles 811 and 812) and nonobviousness in patent law are all examples of using proxy measurement. Nonobviousness was meant to measure the inventors contributions. Yet due to the difficulty of measuring contributions, patent law adopted difference as a proxy variable for contribution. This article borrows from Wittgensteins seeing as and Quines holism to explore how difference is determined. The last part of this article discusses why the patent owner does not have to pay back the value deriving from using prior arts.