This document provides information about working of patents in India. It discusses that patent owners are required to file Form 27 annually to disclose the extent to which a patented invention has been commercially worked in India. Failure to file or providing incorrect information can result in penalties. The objectives of requiring working statements are to ensure patents are used to benefit the public and to prevent misuse of patent rights. It also gives an overview of the case of Natco v. Bayer which involved the first compulsory license granted in India in the pharmaceutical sector.