Introduction:
In Telefonaktiebolaget LM Ericsson (PUBL) v. Controller General of Patents, the Delhi High Court was called upon to examine the rejection of a patent application filed by the Swedish telecom major Ericsson relating to a data security invention in communication networks. The appeal challenged a 2019 order of the Indian Patent Office, which had refused the grant of patent on the ground that the claimed invention lacked an inventive step under Section 2(1)(ja) of the Patents Act, 1970. The matter was heard by a Single Judge Bench presided over by Justice Tejas Karia, who delivered the judgment on December 24, 2025. The Court was tasked with assessing whether the claimed method for protecting data delivered both in-order and out-of-order constituted a genuine technical advancement or whether it was merely an obvious combination of existing technologies already disclosed in prior art. The decision assumes importance not only because it concerns a major multinational technology company, but also because it reiterates the rigorous threshold of inventive step in Indian patent law, particularly in the domain of software and communication protocols, where incremental innovations are often scrutinized against a dense background of existing technical knowledge.
Arguments of Appellant:
Ericsson, assailing the Patent Office’s rejection, contended that its invention addressed a real and persistent technical problem in the field of data communication security. According to the appellant, traditional security protocols were designed on the assumption that data would be delivered in an ordered manner, as is typical in transport protocols like TCP. However, with the increasing use of protocols that allow unordered or partially ordered delivery of data, such as SCTP or UDP-based systems, existing security mechanisms struggled to ensure reliable and secure communication when data packets arrived out of sequence. Ericsson argued that this limitation created vulnerabilities and inefficiencies, particularly in advanced telecom systems where latency, packet loss, and reordering are common.
The appellant submitted that its invention proposed a novel and non-obvious solution by introducing a method that separated ordered delivery data from unordered delivery data at the security protocol layer itself. This separation, Ericsson claimed, allowed the system to apply differentiated security processing depending on the nature of data delivery. For unordered data, the invention introduced the use of sequence numbers at the security layer to ensure integrity and proper handling, while ordered data continued to be processed using conventional mechanisms. According to Ericsson, this architectural distinction at the security protocol level was neither taught nor suggested by prior art and represented a significant technical advancement.
Ericsson further argued that the Patent Office had erred in conducting a hindsight-based analysis by selectively combining features from multiple prior art documents. It was contended that while individual elements such as ordered delivery, unordered delivery, sequence numbers, and security protocols were known, the specific combination and implementation proposed by Ericsson were not obvious to a person skilled in the art at the priority date. The appellant emphasized that the invention flowed from an international patent titled “Protection of Data Delivered Out-of-Order” and claimed priority from a U.S. filing made in March 2005, a time when the convergence of security protocols with unordered delivery mechanisms was still evolving.
The appellant also criticized the Patent Office for failing to appreciate the technical effect achieved by the invention, namely enhanced security and robustness in mixed delivery environments. According to Ericsson, the invention was not a mere workshop improvement but a solution that filled a genuine gap in the existing technological framework. It was submitted that the First Examination Report issued in 2015 and the subsequent hearing in 2019 did not adequately engage with the substance of these technical contributions. On these grounds, Ericsson urged the High Court to set aside the impugned order and direct the grant of the patent.
Arguments of Respondent:
The Controller General of Patents, representing the Patent Office, strongly defended the rejection of the application and argued that the impugned order was well-reasoned, detailed, and in full compliance with the Patents Act. The respondent submitted that the core features claimed by Ericsson were already disclosed in prior art documents and that the alleged invention did not cross the threshold of inventive step required under Indian law. It was argued that the Patent Office had carefully examined documents D1 to D3, which discussed transport protocols such as TCP, SCTP, and UDP, as well as security protocols like SSL and TLS, including their adaptations for handling different modes of data delivery.
According to the respondent, these prior art documents clearly disclosed the concepts of ordered and unordered data delivery, the use of sequence numbers in messages, and the modification of security protocols to accommodate varying transmission characteristics. The respondent contended that a person skilled in the art, reading these documents together, would find it obvious to separate ordered and unordered data streams and apply appropriate security processing to each. The insertion of sequence numbers for unordered data, far from being inventive, was argued to be a routine and logical step already known in the field.
The respondent further submitted that Ericsson’s invention amounted to nothing more than an aggregation of known features, each performing its expected function without producing any unexpected technical effect. The Patent Office emphasized that Indian patent law does not permit monopolies over obvious combinations of existing knowledge, particularly in fast-evolving fields like software and telecommunications. It was also argued that the appellant had failed to demonstrate how the claimed invention went beyond what was already available at the priority date or how it overcame a technical prejudice in the art.
The respondent highlighted that the Patent Office had issued a First Examination Report, granted the applicant an opportunity of hearing, and thereafter passed a speaking order in July 2019, clearly setting out the reasons for rejection. There was, therefore, no procedural irregularity or perversity warranting interference by the High Court. On these grounds, the respondent urged the Court to dismiss the appeal and uphold the rejection under Section 2(1)(ja) of the Patents Act.
Court’s Judgment:
After carefully considering the rival submissions and examining the record, the Delhi High Court dismissed Ericsson’s appeal and upheld the rejection of the patent application. Justice Tejas Karia noted at the outset that the scope of judicial interference with decisions of the Patent Office is limited, particularly where the authority has applied its technical expertise and provided detailed reasoning. The Court observed that it would not sit as an appellate technical body to re-evaluate the merits of the invention unless the findings were shown to be arbitrary, perverse, or contrary to law.
The Court found that the Patent Office had undertaken a thorough analysis of the claimed invention in light of prior art documents D1 to D3. Referring to the technical reasoning in the impugned order, the Court observed that it was adequately explained how a person skilled in the art would find it obvious to separate ordered delivery data and unordered delivery data in a security protocol running on top of a transport protocol. The Court specifically endorsed the finding that the use of sequence numbers, the handling of ordered and unordered messages, and the adaptation of security protocols were all well-known features at the relevant time.
Justice Karia emphasized that the test for inventive step under Section 2(1)(ja) requires not merely novelty, but a technical advance or economic significance that is not obvious to a person skilled in the art. Applying this test, the Court held that Ericsson’s claimed method did not satisfy the requirement of non-obviousness. The Court noted that documents discussing TCP, SCTP, UDP, TLS, and modified SSL/TLS protocols already disclosed the relevant concepts and that combining these teachings would have been within the routine skill of a competent practitioner in the field.
The Court rejected Ericsson’s argument that the Patent Office had engaged in hindsight analysis, observing instead that the conclusion of obviousness was reached through a logical and reasoned comparison with prior art. It further held that the mere assertion of solving a technical problem is insufficient unless the solution itself demonstrates an inventive leap. The Court reiterated that patent protection cannot be granted for incremental or obvious improvements that do not meaningfully advance the state of the art.
On this reasoning, the Court upheld the rejection of the application under Section 2(1)(ja) of the Patents Act and dismissed the appeal, finding no reason to interfere with the Patent Office’s decision.