Madras High Court Rejects Patent Infringement Claims in Battery Swapping Technology Dispute

The Madras High Court recently adjudicated a complex patent infringement dispute involving Arumugam Rajendra Babu, an independent inventor, and five defendants including Ashok Leyland Ltd., Sun Mobility, Virya Mobility 5.0 LLP, Sun New Energy Systems, and Sun Mobility Private Limited. The plaintiff alleged infringement of his patent covering an electrically operated vehicle equipped with a wind-operated battery charging system and a modular, slidable, interchangeable battery housing designed for quick replacement without manual connection or disconnection.

The plaintiff’s patent claimed applicability across various vehicle types, including two, three, four, and multi-wheeled vehicles, facilitating battery swapping at service stations and charging points. He contended that the defendants’ quick interchange stations and smart battery solutions incorporated essential features of his patented modular battery housing without authorization.

In response, Ashok Leyland denied using wind-powered charging in their electric vehicles and asserted that their battery-swapping technology was distinct. They challenged the novelty of the plaintiff’s patent, describing it as an obvious combination of known elements. Sun Mobility highlighted their substantial investment and research since April 2017 in developing automated, semi-automated, and manual battery replacement swap stations under valid licenses.

The defendants further argued the invalidity of the plaintiff’s patent, citing prior art, lack of commercial use, and inconsistencies in claims. They referenced multiple global patents that anticipated the plaintiff’s invention. Additionally, they sought punitive damages for what they described as frivolous litigation aimed at disrupting their business operations.

The plaintiff countered by accusing the defendants of misrepresenting their technology and distorting facts. He maintained that the defendants’ patents copied the modular, slidable battery system outlined in his patent.

A Scientific Advisor’s report supported the defendants’ position, confirming no overlap between the plaintiff’s patent and the defendants’ technologies. The report emphasized that the plaintiff’s invention primarily related to a wind-operated battery charging system and modular battery compartment, whereas the defendants’ battery-swapping stations functioned independently of wind energy and were designed for various modes of battery replacement.

The Court examined prior patents and publications predating the plaintiff’s priority date, which disclosed similar battery-swapping concepts, thereby undermining the novelty and inventive step of the plaintiff’s patent. The Court also noted the plaintiff’s failure to commercialize his patent for over a decade, emphasizing that patent grant alone does not establish infringement without technical proof.

In its ruling, the Court stated, “While the prior art presented by the defendants indicates that some aspects of the plaintiff’s patent lack novelty, the fact that the plaintiff has exploited his patent technology over the last 18 plus years and has not actively hindered market competition (i.e., by directly preventing others from developing charging stations or electric vehicle technologies), deserves consideration.”

Ultimately, the Court dismissed the plaintiff’s suit, concluding that the defendants’ battery-swapping technology did not infringe the plaintiff’s wind-powered charging patent. The Court declined to revoke the plaintiff’s patent, recognizing his contributions and the patent’s near full-term exploitation. The defendants’ counterclaim for revocation was also rejected, with the Court permitting coexistence of the patents.