By Jigyasa Pareek

The Delhi High Court in Communication Components Antenna Inc. vs Rosenberger Hochfrequenztechnik GmbH & Ors. [CS(COMM) 653/2019] delivered a detailed judgment concerning the validity and infringement of patent number 240893, entitled “Asymmetrical Beams for Spectrum Efficiency”. The suit concerned technology relating to split-sector antennas used in cellular communication networks, with the Plaintiff alleging that the Defendants’ multi-beam antennas employing asymmetrical beam patterns infringed the suit patent. The Defendants, in turn, challenged the validity of the patent on several grounds, including lack of novelty, lack of inventive step, insufficiency of disclosure, failure to sufficiently define the invention, false representation, and non-patentability. The Court rejected all the grounds of invalidity, upheld the validity of IN’893, found the Defendants’ products to be infringing, and granted a permanent injunction together with damages of Rs. 1,52,32,36,783.90. The Court also directed issuance of a certificate of validity under Section 113 of the Patents Act, 1970.

The invention concerned the use of a split-sector antenna having asymmetrical sub-sector coverage areas in a sectorized cellular communication network. The underlying problem addressed by the invention arose from attempts to increase subscriber capacity by increasing the number of sectors served by an antenna. While higher-order sectorization could increase capacity, it could simultaneously increase overlap between adjacent beams and consequently enlarge handover zones, thereby reducing the effective or “critical” coverage area. The patent sought to address this problem by replacing an existing sector antenna with a split-sector antenna having multiple sub-sector coverage areas, at least one of which was asymmetrical. The objective was to use asymmetrical beams in a manner that would permit increased sectorization while maintaining a substantially equivalent critical coverage area and reducing the handover areas between the relevant sectors and sub-sectors.

Claim 1 related to the method of using such a split-sector antenna in a sectorized cellular communication network, while Claim 10 concerned the sub-sector antenna itself. Dependent claims further addressed, inter alia, multiple asymmetrical coverage areas, mirror-image pairs, particular beam widths, minimal side lobes and passive or active networks for implementing the asymmetrical sub-sector coverage area. The patent was stated to remain valid until 19 March 2027.

The validity of the patent had also been considered in earlier litigation including TenXC Wireless Inc. & Anr. v. Mobi Antenna Technology (Shenzhen) Co. Ltd. and Communication Components Antenna Inc. v. Ace Technologies. In proceedings involving Mobi Antenna, the patent had been revoked on grounds of insufficiency by the Single Judge, but that finding was set aside and the matter was reconsidered. Ultimately, the suit against Mobi Antenna resulted in a finding of infringement and substantial damages of USD 2,60,45,250. In another proceeding involving Ace Technologies, the Court had granted interim protection after noting that circumstances surrounding the validity of the patent had materially changed, including the grant and subsequent upholding of the corresponding US patent (number 8,311,582) and the issuance of a global licence to the entity that challenged the validity of the US patent (CommScope).

The corresponding European application, however, had encountered objections concerning clarity, sufficiency and other requirements before subsequently being deemed withdrawn when the applicant did not respond to the examination objections.

In the instant case, the Defendants raised multiple grounds of invalidity under Section 64 of the Patents Act. These included lack of novelty under Section 64(1)(e), lack of inventive step under Section 64(1)(f), insufficiency under Section 64(1)(h), failure to sufficiently define the invention under Section 64(1)(i), false representation under Section 64(1)(j), and non-patentability under Section 64(1)(k). The Court specifically noted that the burden of establishing invalidity rested upon the Defendants.

Notably, given the limited remaining term of the patent, the Court conducted the trial under Rule 16 of the Delhi High Court Patent Rules, 2022, by way of summary adjudication, with live transcription of evidence and a streamlined evidentiary process.

Key Findings:

• The Court emphasized that the invention was not directed to asymmetrical antennas generally, but to asymmetrical sub-sector coverage areas used in a manner that maintained the same critical coverage area while reducing overlap and handover zones. It held that the phrase “substantially equivalent” in the context of the “critical coverage area” was to be understood in the context of the invention rather than with mathematical precision; “substantially equivalent” meant maintaining the effective coverage area of the earlier antenna.
• The Court reiterated the distinction between novelty and inventive step. For determining novelty, the prior art documents could not be “mosaiced” or read cumulatively. Each document had to be considered independently, and a generic disclosure could not by itself defeat the novelty of a specific and limited disclosure.
• Applying the settled principle that the entire subject invention must be disclosed in the prior art for anticipation, the Court held that none of the cited documents anticipated IN’893. The objection under Section 64(1)(e) was accordingly rejected.
• On inventive step, the Court noted that whenever multiple documents are relied upon for the purpose of arguing lack of inventive step, the said documents ought to be interlinked or connected in some manner. Such linkage may arise from the relevant field, the problem being solved, or a common source.
• The Court reiterated that obviousness must be assessed from the perspective of the person skilled in the art (PSITA), and that the jump from the state of the art to the patented invention must be smooth and obvious, without requiring too much imagination.
• The Court observed that a challenge to inventive step cannot be constructed by searching databases for patents containing isolated references to terms and then mosaicing those documents in an attempt to invalidate the patent, without connecting the dots. The Court described this as a “Dartboard approach”, under which the defendants hope to hit the bull’s-eye with unrelated prior art documents, and remarked that this approach in patent litigation ought to be dealt with imposition of heavy costs.
• On the facts, the Court found no such linkage among the nine cited prior art documents. The documents were either materially distinguishable from the invention or belonged to different technological environments. The Court therefore held that the Defendants had failed to establish lack of inventive step under Section 64(1)(f).
• The Court held that the claims had to be construed in light of the complete specification and that reliance on prosecution history before foreign jurisdictions would not, by itself, be sufficient to establish insufficiency under Indian law.
• The Court noted that no patent can be expected to contain all the permutations and combinations. Section 10 requires the invention to be fully and particularly described, including its operation/use, and the best method by which it is to be performed, including other methods known to the patentee.
• The Court noted that the Defendants had advanced mutually contradictory grounds, arguing, inter alia, that the invention was a natural phenomenon, a scheme or mental act, and devoid of technical features, and considered these contradictory positions indicative of a lack of seriousness in the challenge.
• After considering the complete specification, the claims, the prior art, the evidence of the witnesses and independent material placed on record, the Court concluded that the Defendants had failed to discharge their burden of establishing invalidity. The Court specifically took note of post-grant material, including the 3G Americas white paper, the US PTAB’s rejection of the validity challenge to the corresponding US patent.
• On infringement, the Court clarified that claim construction must precede the infringement analysis, and that infringement is to be determined by comparing the essential features of the claims with the impugned product. The Court accepted the Plaintiff’s technical evidence mapping the Defendants’ product brochures on the granted claims as the impugned products were not produced before the Court.
• The Court emphasized that expert testimony must be evaluated together with the complete technical record, including the patent specification, technical literature, product documentation and cross-examination, rather than in isolation. It ultimately found the Plaintiff’s evidence more credible and technically persuasive than the Defendants’ invalidity and non-infringement case.
• In assessing monetary relief, the Court reiterated that royalty is an appropriate measure of compensatory damages in patent infringement actions. Relying on an existing licence agreement with CommScope as a reference for the range, the Court held that an infringer should not be placed in the same position as a licensee, who has bonafidely negotiated a license and awarded damages based on a 20% royalty on the Defendants’ sales.
• In assessing damages, the Court considered, inter alia, the nature of the industry, the sales made by the parties, the duration of infringement and the available measures of compensation, including loss of profits, price erosion and royalty/licence-fee income. The Court held that loss of profits could not, on the facts, be calculated solely on the basis of the Defendants’ sales and that price erosion or a reasonable royalty would provide a more appropriate measure.
• The Court granted a permanent injunction, awarded damages of ₹1,52,32,36,783.90, directed that further damages on additional sales be computed at the same 20% royalty rate on subsequently disclosed sales, and awarded taxed costs in favor of the Plaintiff.