What is necessary for an invention to demonstrate "utility" according to patent law?

An invention demonstrates "utility" in patent law by showing that it possesses functional ability, meaning it must be capable of providing some identifiable benefit or practical use. This functional ability does not depend on the quality or performance level of the invention but instead focuses on whether the invention can perform its intended function.

For instance, even a basic invention that solves a problem in a specific way can qualify as useful as long as it fulfills its stated purpose. This low threshold ensures that a wide range of inventions can be patented, as long as they are operable and serve a purpose.

Considering the other options, a creative and innovative design may enhance an invention's appeal but is not a requirement for utility. Similarly, market demand or evidence of public interest, while potentially indicative of an invention's success or relevance, does not factor into the legal definition of utility under patent law. The primary criterion remains the invention's functional capability.