A more thorough explanation:

Definition: Inoperable mode refers to a way of working an invention that is disclosed in a patent application but is not the best mode. This term is usually used to describe a mode that is intended to misrepresent or deliberately conceal the best mode. Such misrepresentation or concealment is considered unfair conduct that can prevent the patent from being granted or render an issued patent unenforceable.

For example, if a patent application discloses a way of working an invention that is not the most effective or efficient, but the inventor intentionally conceals the best mode, this would be considered an inoperable mode. Another example would be if the inventor discloses a mode that they know will not work, but they do so to mislead competitors or the patent office.

These examples illustrate how an inoperable mode can be used to deceive others and gain an unfair advantage in the patent process. It is important for inventors to disclose the best mode of their invention to ensure that their patent is valid and enforceable.