India: Delhi High Court Awards ₹152 Crore in Patent Infringement Case Against Rosenberger

In one of the largest damages awards in an intellectual property dispute in India, the Delhi High Court has directed German telecom company Rosenberger Group and its affiliated entities to pay more than ₹152 crore to Canadian firm Communication Components Antenna Inc. (CCAI) for patent infringement.

The judgment, delivered on Monday by Justice Prathiba M. Singh, addressed not only the infringement claims but also broader issues such as evaluation of digital evidence, calculation of damages in competitive markets, and the potential misuse of artificial intelligence in patent litigation.

Background of the Dispute

The case centered on technology used in cellular tower antennas. CCAI holds an Indian patent for a telecom antenna design that uses asymmetrical beam patterns to improve network performance and increase subscriber capacity.

Traditional cellular towers divide coverage areas into sectors using symmetrical beams. However, increasing the number of beams can create overlapping zones that lead to signal interference and dropped calls. CCAI’s patented technology addressed this problem by dividing sectors into smaller sub-sectors using asymmetrical beams, allowing networks to handle more users without increasing interference.

CCAI alleged that Rosenberger and its Indian affiliate, Prose Technologies, sold antennas incorporating similar asymmetrical beam patterns to major telecom operators including Reliance Jio and Bharti Airtel. After licensing negotiations failed, CCAI filed a lawsuit in 2019 seeking an injunction and damages.

Court Rejects ‘Mosaicing’ Defence

Rosenberger attempted to invalidate CCAI’s patent by citing nine earlier patents as prior art, arguing that the invention was obvious. However, the court rejected this approach, invoking the legal doctrine against “mosaicing,” which prohibits combining unrelated prior art using hindsight to claim obviousness.

Justice Singh described the defendants’ strategy as a “Dartboard Model,” stating that Rosenberger placed the patent at the center and threw unrelated prior art references in hopes that one would undermine the patent.

The court also warned that artificial intelligence tools and large language models could make it easier to cite unrelated prior art in future patent disputes, urging courts to apply deeper scrutiny to such defenses.

Digital Evidence Accepted

Another key issue involved proving infringement without access to physical antennas, which were not produced by the defendants during trial. The court criticized Rosenberger’s failure to provide physical evidence, describing the conduct as evasive.

CCAI instead relied on software simulations using MATLAB to replicate the patented technology and compare it with beam pattern data from Rosenberger’s marketing materials. The court accepted this digital evidence in finding infringement.

Damages Calculation

CCAI initially sought damages based on lost profits, arguing that Rosenberger’s sales to telecom operators represented lost business opportunities. The court rejected this method, noting that telecom procurement typically involves reverse auctions where price and service factors influence decisions.

Instead, the court applied a “reasonable royalty” approach. Based on an existing licensing agreement submitted under seal, the court determined that a 20 percent royalty on antenna sales was appropriate.

Applying this rate to Rosenberger’s sales figures, the court awarded damages totaling ₹152,32,36,783 and ordered Rosenberger to pay the amount within three months.

The ruling is expected to have significant implications for patent litigation in India, particularly in cases involving digital evidence, AI-assisted legal arguments, and damages calculations in highly competitive technology markets.