Case Details
- Citation: [2020] SGHC 26
- Case Title: Element Six Technologies Ltd v IIa Technologies Pte Ltd
- Court: High Court of the Republic of Singapore
- Date of Decision: 07 February 2020
- Decision Reserved: 07 February 2020 (judgment reserved; decision delivered on 07 February 2020)
- Judge: Valerie Thean J
- Coram: Valerie Thean J
- Case Number: Suit No 26 of 2016
- Plaintiff/Applicant: Element Six Technologies Ltd
- Defendant/Respondent: IIa Technologies Pte Ltd
- Counsel for Plaintiff: Alvin Yeo SC, Daniel Chan, Vivian Siah, Daryl Kwok (WongPartnership LLC) (instructed counsel); Chan Kwok Chuan Jason, Pang Sze Ray Melvin, Nicholas Tong Wei Jie, Ong Eu Jin (Amica Law LLC) for the plaintiff
- Counsel for Defendant: Davinder Singh SC, Srruthi Ilankathir, Hanspreet Singh (Davinder Singh Chambers LLC) (instructed counsel); Tony Yeo Soo Mong, Meryl Koh Junning, Yeo Javier and Chiew Jing Yi (Drew & Napier LLC) for the defendant
- Legal Areas: Patents and Inventions — Validity; Patents and Inventions — Infringement
- Statutes Referenced: Patents Act (Cap 221, 2005 Rev Ed) / Patents Act 1977
- Key Patents in Suit: Singapore Patent No 115872 (“SG 872”); Singapore Patent No 110508 (“SG 508”)
- Key Claims in Dispute: SG 872 Claim 1 (product); SG 872 Claim 62 (process); SG 508 Claim 1 (process)
- Judgment Length: 119 pages; 56,550 words
Summary
Element Six Technologies Ltd v IIa Technologies Pte Ltd concerned a patent infringement and validity dispute involving synthetic diamond materials grown by chemical vapour deposition (“CVD”). The plaintiff, a UK company in the Element Six group, alleged that the defendant, a Singapore-based manufacturer of CVD diamonds, infringed two Singapore patents: SG 872 and SG 508. The plaintiff’s infringement case relied on three diamond samples purchased between 2014 and 2015, before the suit commenced on 12 January 2016.
The High Court (Valerie Thean J) held that SG 872 was valid and infringed by the samples, while SG 508 was not valid. The court further found that the samples originated from the defendant and that, as a matter of claim construction and infringement analysis, the samples fell within SG 872’s claimed subject matter but did not infringe SG 508. The decision is notable for its careful approach to claim construction, its application of novelty and inventive step principles under the Patents Act, and its treatment of technical evidence in a complex materials science context.
What Were the Facts of This Case?
The plaintiff specialises in producing synthetic diamond material using CVD techniques for technical applications such as optics, semiconductors, and sensors. CVD diamond growth involves placing a diamond seed on which diamond is grown in a reactor containing a mixture of gases, with atoms bombarding the substrate to build up diamond crystal structure. The defendant is a major manufacturer of CVD diamonds, operating a diamond growing facility in Singapore. Both parties operate in the same technological domain, which made the dispute heavily dependent on technical characterisation of diamond properties and the interpretation of patent claims.
SG 872 contains both product and process claims. The central product claim was Claim 1, which described a CVD single crystal diamond material of a specified thickness (at least 0.5 mm) exhibiting low optical birefringence, a property used to indicate low strain and suitability for high-end optical applications. The claim specified quantitative thresholds and measurement conditions, including that in a sample of at least 1.3 mm x 1.3 mm and thickness at least 0.5 mm, the modulus of the sine of the phase shift, |sin δ|, remained within defined limits for at least 98% of the analysed area (and, in another limb, for 100% of the area) and that the maximum value of Δn[average] did not exceed a specified threshold.
SG 872 also included a key process claim, Claim 62, which described a method of producing the CVD diamond material. The process involved substrate preparation and deliberately adding nitrogen to the synthesis process. The claim required selecting a nitrogen concentration range (300 ppb to 5 ppm) to balance competing objectives: preventing or reducing local strain-generating defects while also avoiding deleterious absorptions and crystal quality degradation. This “deliberate nitrogen addition” and the claimed concentration range were central to the validity and infringement analysis.
SG 508, by contrast, was a process claim concerning controlled conversion of a coloured single crystal CVD diamond to another colour through suitable and controlled heat treatment conditions, commonly referred to as annealing. The claim contemplated producing colours including those in the pink-green range. The plaintiff’s infringement case for SG 508 therefore depended on whether the defendant’s diamonds (or the defendant’s supply chain) had been subjected to the claimed controlled annealing conditions to achieve the claimed colour conversion.
What Were the Key Legal Issues?
The court identified three main issues: (a) the validity of SG 872 and SG 508; (b) whether the defendant was responsible for the samples relied upon by the plaintiff; and (c) whether the samples infringed SG 872 and SG 508. These issues reflect the typical structure of patent litigation in Singapore where validity and infringement are often contested together, and where the evidential burden can turn on the provenance of allegedly infringing products.
On validity, the defendant sought revocation of both patents. The court therefore had to assess whether the inventions satisfied the statutory requirements for patentability, including novelty and inventive step, under s 13(1) of the Patents Act. The analysis required claim construction because novelty and inventive step are assessed by reference to the properly construed claims.
On infringement, the plaintiff relied on three samples: Sample 2 (product code “2PCVD303004N”), purchased from Microwave Enterprises Ltd (MWE) on behalf of the plaintiff; Sample 3 (product code “LG10225420”), purchased from Pure Grown Diamonds Inc (PGD); and Sample 4 (product code “2PCVD505005N”), purchased directly from the defendant in Singapore. The defendant denied responsibility for the samples and argued that, in any event, the samples did not infringe the patents. The court had to determine both provenance and technical fit with the claim elements.
How Did the Court Analyse the Issues?
The court began with claim construction, treating it as integral to both validity and infringement. It reaffirmed that the claims are the principal determinant of the monopoly granted, and that what is not claimed is deemed disclaimed. The court also emphasised purposive construction: claims should be construed in context and not merely literally, but without rewriting or adding to clear and unambiguous claim language. This approach is consistent with the Court of Appeal’s guidance in cases such as First Currency Choice v Main-Line Corporate Holdings Ltd and Lee Tat Cheng v Maka GPS Technologies Pte Ltd.
In applying these principles, the court considered the “person skilled in the art” (“PSA”) for the relevant field. The parties disagreed on the PSA’s composition and expertise. The plaintiff suggested a team with broad knowledge of diamond properties across natural, HPHT, and CVD diamonds, and commercial production knowledge. The defendant suggested a more engineering- and physics-heavy PSA. The court held that the distinction had no practical significance because the relevant PSA would be a team of individuals with expertise in diamonds and science generally, including access to doctorate-level qualifications. The court’s focus was on the practical reality that both parties’ expert teams included scientists with doctoral qualifications and relevant technical expertise.
For SG 872 Claim 1, the court concentrated on the claim’s quantitative thresholds for birefringence and the measurement conditions. The claim required that the diamond material, when measured at room temperature, exhibited low optical birefringence indicative of low strain, with specified constraints on |sin δ| and Δn[average] over defined sample thickness and analysed area. This meant that infringement and validity could not be assessed at a high level of generality; rather, the court needed evidence about the diamond’s optical properties and whether they fell within the claimed ranges.
On validity, the court applied the statutory framework for patentability under s 13(1) of the Patents Act, focusing on novelty and inventive step (industrial applicability was not disputed). The court referenced Mühlbauer AG v Manufacturing Integration Technology Ltd for the three patentability conditions: novelty, inventive step, and industrial application. Claim construction was again critical because the novelty and inventive step inquiries depend on the precise features claimed. In a technical field like CVD diamond growth, where prior art may disclose general processes or broad material properties, the court’s analysis necessarily turned on whether the prior art disclosed the specific combination of features—particularly the low birefringence characteristics measured under the claim’s defined conditions.
Although the judgment extract provided is truncated, the court’s ultimate holding was clear: SG 872 was valid. This implies that, after construing Claim 1 and Claim 62, the court found that the claimed subject matter was not anticipated by the relevant prior art and involved an inventive step. The court’s reasoning would have required identifying the closest prior art, determining the differences between it and the claimed invention, and assessing whether those differences would have been obvious to the PSA at the relevant time. The presence of a carefully selected nitrogen concentration range in Claim 62, and the claim’s quantitative birefringence thresholds in Claim 1, likely played a central role in distinguishing the claimed invention from prior disclosures.
For SG 508, the court held that the patent was not valid. While the extract does not reproduce the full reasoning, the conclusion indicates that at least one of the statutory requirements—most likely novelty or inventive step—was not satisfied. In colour conversion and annealing processes, prior art may disclose annealing generally or disclose annealing conditions capable of producing similar colour outcomes. If the claim’s specific conditions or resulting colour conversion were already disclosed or would have been obvious, the court would have been compelled to revoke the patent.
On infringement, the court addressed both responsibility for the samples and whether the samples fell within the scope of the claims. The court found that Samples 2, 3, and 4 originated from the defendant. This finding mattered because the plaintiff’s infringement case depended on the samples being produced or supplied by the defendant or its related entities. Once provenance was established, the court compared the samples’ properties and production characteristics against the properly construed claim elements.
The court held that the samples infringed SG 872 but not SG 508. This outcome reflects the different technical focuses of the two patents. SG 872’s claimed subject matter related to low optical birefringence and, in the process claim, nitrogen addition within a specific concentration range to manage strain and crystal quality. If the defendant’s CVD diamonds produced the required low birefringence characteristics and were made using the claimed nitrogen-related process features, infringement would follow. For SG 508, however, infringement would require proof that the defendant’s diamonds had been subjected to the claimed controlled annealing conditions to achieve the claimed colour conversion. The court’s finding that the samples did not infringe SG 508 suggests that either the relevant annealing conditions were not shown to have been used, or the resulting colour conversion did not meet the claim’s requirements as properly construed.
What Was the Outcome?
The High Court held that SG 872 was valid and infringed by Samples 2, 3, and 4. Conversely, SG 508 was held to be invalid. The court also found that, although the samples originated from the defendant, they did not infringe SG 508. Practically, this meant that the plaintiff succeeded in enforcing SG 872 against the defendant, but could not rely on SG 508 because it was revoked.
The practical effect of the decision is twofold: first, it confirms that the defendant’s CVD diamond products fell within the monopoly claimed by SG 872, at least on the evidence relating to the samples; second, it removes SG 508 from the patent register by revocation, preventing the plaintiff from obtaining relief based on that patent.
Why Does This Case Matter?
This decision is significant for practitioners because it demonstrates how Singapore courts approach patent disputes in highly technical fields where claim language is quantitative and measurement-dependent. The court’s insistence on proper claim construction—grounded in purposive interpretation but constrained by the clear words of the claims—highlights that parties cannot rely on general technical overlap. Instead, they must address the claim’s specific features, including defined measurement conditions and numerical thresholds.
From a validity perspective, the case illustrates the importance of tailoring novelty and inventive step arguments to the properly construed claim elements. Where a patent claim is drafted to capture a particular technical balance (for example, nitrogen concentration to manage strain defects while avoiding optical absorption and crystal degradation), the novelty and inventive step analysis will likely turn on whether prior art disclosed that balance or would have made it obvious to the PSA.
From an infringement perspective, the case underscores the evidential importance of provenance and responsibility. The court’s finding that the samples originated from the defendant shows that infringement analysis may depend on establishing the chain of supply and the relationship between the defendant and third-party distributors. For law students and litigators, the case is also a useful example of how courts integrate technical evidence with legal tests, and how outcomes can differ across multiple patents even when the same product line is involved.
Legislation Referenced
- Patents Act (Cap 221, 2005 Rev Ed) — s 13(1) (conditions for patentability: novelty, inventive step, industrial application)
- Patents Act 1977 (as referenced in the case materials)
Cases Cited
- Mühlbauer AG v Manufacturing Integration Technology Ltd [2010] 2 SLR 724
- First Currency Choice v Main-Line Corporate Holdings Ltd and another appeal [2008] 1 SLR(R) 335
- Lee Tat Cheng v Maka GPS Technologies Pte Ltd [2018] 1 SLR 856
- [2000] SGHC 53
- [2020] SGHC 26
Source Documents
This article analyses [2020] SGHC 26 for legal research and educational purposes. It does not constitute legal advice. Readers should consult the full judgment for the Court's complete reasoning.