This article considers the interplay between intellectual property rights and classic property rights raised by Hoffman v. Monsanto (2005) and advances the idea that intellectual property law can serve as an autonomous source of liability for intellectual property owners. The article develops the conceptual advantages of demarcating physical and intellectual properties and allocating rights and responsibilities based on the respective property sphere. It introduces a theoretical Hohfeldian framework, in which the grant of a positive limited-term monopoly right entails a corresponding duty, to establish intellectual property law as a source of internal limits on intellectual property rights. The article is a prolegomena to a detailed matrix of those rights and duties within intellectual property law. This matrix could support patentee duties that go beyond public disclosure of the invention and could establish patent law as an alternative legal framework to tort law to address harms caused by inventions. (Contains 2 notes.)