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This paper considers why a patent-holder would have low incentives to reduce the uncertainty of patent boundary. Clearer patent rights, i.e., when patent examination results are more informative about subsequent court decisions, provide better guidance to technology-specific investment and encourage technology adoption. Under mild conditions, however, the patent-holder's post-adoption payoff is decreasing in clarity. The patent-holder prefers to maintain "fuzzy" patent rights when she wants to monopolize the use of the technology, or when promoting technology diffusion is not a strong concern. The latter happens when the patent-holder, as a pure licensor, has a low (ex ante) quality invention.