M.C.Jayasingh v. Mishra Dhatu Nigam Limited (MIDHANI)

In the high-stakes world of medical innovation, timing is everything. A patent can be your strongest shield, but only if a court believes you need urgent protection. When M.C. Jayasingh, the holder of patents for a Custom Mega Prosthesis used in limb salvage surgery, watched a public sector competitor allegedly step into his territory, he turned to the courts for an emergency injunction. What followed was a sobering lesson on why interim relief is not handed out lightly—and why inventors must come prepared with more than just a valid patent.

M.C. Jayasingh, the appellant, held patents related to a Custom Mega Prosthesis—a specialized medical device used in limb salvage surgery, a procedure that can mean the difference between amputation and recovery for patients facing severe bone or joint damage. The respondent, Mishra Dhatu Nigam Limited (Midhani), is a public sector undertaking. Jayasingh filed a suit seeking a perpetual injunction, alleging that Midhani was infringing his patented technology. Before the full trial could unfold, Jayasingh sought an interim injunction—an urgent court order to stop the alleged infringement while the case was still being decided. A single judge reviewed his request and rejected it. Jayasingh then appealed that rejection, bringing the matter before the appellate court on 29 April 2009.

Jayasingh's argument centered on the value of his patented innovation and the harm he stood to suffer if Midhani continued its allegedly infringing activities during the pendency of the suit. As the holder of patents for a device with life-changing medical applications, he contended that the court should step in immediately to preserve his rights. On the other side, the respondent presented a case that was sufficient to convince the single judge—and later the appellate court—that an interim injunction was not warranted. The legal friction here was classic: an inventor claiming urgent harm versus a respondent whose product similarities were not immediately apparent, and whose operations carried public sector weight. The court had to weigh whether Jayasingh had demonstrated the kind of irreparable injury and balance of convenience that would justify halting the respondent's activities before the full trial.

The appellate court upheld the rejection of the interim injunction. The outcome was defendant-favorable, meaning Midhani was not required to halt its operations during the pendency of the suit. The decision underscored a fundamental principle of patent litigation: interim injunctions are extraordinary remedies, not automatic entitlements. Even when a patent holder has a legitimate grievance, the court must be convinced that waiting for a full trial would cause harm that cannot be undone, and that the inconvenience to the party being restrained outweighs the harm to the patent holder. Without a clear demonstration of irreparable injury and a convincing balance of convenience, the court will not pull the emergency brake.

For founders, inventors, and IP professionals, this case is a stark reminder: holding a patent is not the same as securing immediate protection. If you believe your patent is being infringed, do not assume that a court will grant an emergency injunction simply because your patent is valid. You must build a compelling case for irreparable injury—showing that the harm you face cannot be compensated by money or fixed after a full trial. Equally important, you must demonstrate that the balance of convenience tips in your favor. When product similarities are not immediately obvious, or when the alleged infringer is a large or public entity with significant operations, the court will be even more cautious. Prepare your evidence meticulously, document every instance of alleged infringement, and consult experienced IP counsel before seeking interim relief. In patent disputes, the strongest shield is one backed by unshakeable proof.