Case Details
- Citation: [2017] SGHC 310
- Court: High Court of the Republic of Singapore
- Date: 8 December 2017
- Judges: George Wei J
- Case Title: ROHM AND HAAS ELECTRONIC MATERIALS CMP HOLDINGS, INC. (FORMERLY KNOWN AS RODEL HOLDINGS, INC.) v NEX
- Parties: Rohm and Haas Electronic Materials CMP Holdings, Inc (formerly known as Rodel Holdings, Inc) (Plaintiff/Applicant) v NexPlanar Corporation and Wah Lee Tech (Singapore) Pte Ltd (Defendants/Respondents)
- Suit No: Suit No 470 of 2012
- Procedural History: Trial heard over ten days in January 2017; closing submissions filed in March 2017; judgment reserved; delivered 8 December 2017
- Legal Areas: Patents and Inventions (Validity; Novelty; Inventive step; Sufficiency; Infringement)
- Statutes Referenced: Patents Act (Cap 221, 1995 Rev Ed)
- Key Patent: Singapore Patent No 43335 titled “Polymeric Polishing Pad Containing Hollow Polymeric Microelements”
- Patent Status: Expired on 2 August 2013
- Claims in Issue: Eight asserted claims; only claims 1 and 21 are independent; other asserted claims relate back to claim 1
- Priority and Grant Basis: Grant obtained on 19 September 2000 under s 29(1)(c) of the Patents Act by relying on corresponding US patent (US Patent No 5,578,362); priority claimed from 19 August 1992
- Judgment Length: 119 pages; 34,692 words
- Cases Cited (as provided): [2000] SGHC 53; [2017] SGHC 310; [2017] SGHC 48
Summary
This High Court decision concerns a patent dispute over semiconductor chemical mechanical polishing (“CMP”) pads. The plaintiff, Rohm and Haas Electronic Materials CMP Holdings, Inc (formerly Rodel Holdings, Inc), was the registered proprietor of Singapore Patent No 43335 for a “Polymeric Polishing Pad Containing Hollow Polymeric Microelements”. The defendants, NexPlanar Corporation and Wah Lee Tech (Singapore) Pte Ltd, were alleged to have infringed the asserted claims by selling and dealing with CMP polishing pads manufactured by the first defendant and imported/resold by the second defendant.
The court addressed both infringement and validity. On validity, the defendants challenged the patent on grounds of lack of novelty, lack of inventive step, and insufficiency. The judgment also required the court to construe the asserted claims—particularly terms relating to the “work surface” and “texturized work surface”—and to determine whether the defendants’ products fell within the scope of those claims, including whether “new, as-received and unconditioned” pads could infringe. The court further considered whether the defendants could be regarded as joint tortfeasors in relation to infringement acts by customers of the second defendant.
Ultimately, the court’s reasoning turned on a careful assessment of claim construction, the technical evidence on how the accused pads functioned, and the patentability requirements under the Patents Act. The decision is significant for practitioners because it illustrates how Singapore courts approach complex technical patent claims, the evidential burden in validity challenges, and the legal framework for infringement analysis where the accused products may differ in surface condition or configuration.
What Were the Facts of This Case?
The plaintiff is a US-incorporated company and a subsidiary of Dow Chemical. It held Singapore Patent No 43335, which concerned CMP polishing pads used in semiconductor manufacturing. CMP is a process that smoothens wafer surfaces using a combination of mechanical pressure and chemical slurry. In operation, a wafer is pressed against a rotating polishing pad while both rotate, and a slurry is dispensed to assist planarisation. The patent’s claimed invention relates to the structure and functional behaviour of the polishing pad during wear.
At a high level, the patent claims a polymeric matrix impregnated with hollow, flexible organic polymeric microelements. The pad has a “work surface” and a “subsurface” proximate to that work surface. Microelements at the work surface are exposed to the working environment (including polishing slurry), and are relatively softer than microelements embedded in the subsurface, which are not exposed. As the work surface wears out, the subsurface becomes the new work surface. The patent’s functional premise is that regeneration of the surface through exposure of previously embedded microelements results in more consistent and even polishing.
The patent contains 21 claims, but only eight were asserted in the infringement proceedings. Claims 1 and 21 were independent. Claim 21 differs from claim 1 by describing the “work surface” as a “texturized work surface”. The remaining asserted claims (including claims that specify features such as distribution, urethane matrix, microelement diameter, spacing, spherical shape, permeable shells, and texturisation) were dependent on claim 1 and thus tied to the core structural and functional features.
On the defendants’ side, the first defendant, NexPlanar Corporation, designs and manufactures CMP pads. The second defendant, Wah Lee Tech (Singapore) Pte Ltd, is a Singapore company that imports and purchases CMP pads from suppliers (including the first defendant) and resells them to customers in Singapore. The plaintiff alleged that certain NexPlanar pads—identified by model numbers—corresponded to the asserted claims. The defendants denied infringement and counterclaimed for revocation, arguing that the patent was invalid for lack of novelty, lack of inventive step, and insufficiency of particulars.
What Were the Key Legal Issues?
The case raised several interlocking legal issues typical of patent litigation in Singapore: first, whether the asserted claims were novel; second, whether they involved an inventive step; third, whether the patent was sufficiently disclosed (sufficiency); and fourth, whether the defendants’ accused pads infringed the asserted claims as properly construed.
For novelty and inventive step, the court had to consider what constituted the relevant “state of the art” and whether prior disclosures anticipated the claimed invention. The judgment’s structure indicates that the defendants relied on prior use and sale of certain “IC-1000” pads, and also on other prior art including published materials and earlier patents. A further complexity was whether disclosures made in confidential contexts—such as dealings with Intel and/or Sematech—could be treated as prior disclosure for novelty purposes, depending on whether an express or implied obligation of confidence existed.
For infringement, the court had to construe the asserted claims, applying established claim construction principles. The judgment references the Catnic/Improver approach and the impact of Eli Lilly, signalling that the court considered how to interpret claim language in a purposive manner while respecting the boundaries of the patentee’s monopoly. In particular, the court analysed the meaning of “work surface” and “texturized work surface”, and then assessed whether the three tested NexPlanar pads infringed, and whether the remaining nine untested pads also fell within the claims. Finally, the court considered whether the defendants could be treated as joint tortfeasors in relation to infringement acts by customers of the second defendant.
How Did the Court Analyse the Issues?
The court began by setting out the patent’s technical context and the claimed invention’s functional behaviour during CMP pad wear. This was important because the asserted claims were not merely structural; they also described relative softness between microelements at the work surface and those embedded in the subsurface, and the functional consequence that the subsurface becomes the relatively softer work surface during wear. The analysis therefore required the court to understand how the microelements interact with the polishing slurry and how the pad’s surface evolves over time.
On novelty, the court applied legal principles governing anticipation. Anticipation requires that a single prior art disclosure (or a single prior use/sale event, depending on the evidence) discloses all the essential features of the claimed invention, either explicitly or implicitly, in a manner that enables the skilled person to carry out the invention. The judgment’s outline shows that the court examined the “IC-1000” pads alleged to have been sold and used prior to the plaintiff’s priority. It also addressed whether Intel owed the plaintiff an express or implied obligation of confidence, and whether particular events—such as a Sematech conference or the plaintiff’s dealings with Sematech—amounted to prior disclosure.
A key part of the novelty analysis concerned the treatment of confidential disclosures. If information is disclosed under an obligation of confidence, it may not be treated as public prior art for novelty purposes. The court therefore had to determine whether the circumstances created an express obligation of confidence, or whether such an obligation could be implied from the relationship and the conduct of the parties. The judgment also considered whether a brochure amounted to commercial disclosure of the “IC-1000” pads. This reflects a common patent litigation theme: not every disclosure or communication in industry settings is necessarily “public” for novelty purposes; the legal characterisation of confidentiality can be decisive.
On inventive step, the court applied the structured approach used in Singapore patent cases. The analysis required identifying the inventive concept of the patent, the skilled addressee with common general knowledge, and the differences between the state of the art and the claimed invention. The judgment’s outline indicates that the court considered multiple categories of prior art, including a Japanese patent, the Robie patent, Akzo Nobel publications, and other materials. The court then assessed whether the differences would have been obvious to the skilled person at the relevant time, taking into account whether the claimed solution was merely an aggregation of known features or whether it involved a non-obvious technical contribution.
On sufficiency, the court considered whether the patent met the statutory requirement that the specification disclose the invention clearly enough and completely enough for it to be performed by a person skilled in the art. In technical patent cases, sufficiency often overlaps with claim construction and the adequacy of the disclosure of parameters (such as microelement size, spacing, and permeability of shells). The judgment’s outline indicates that the court treated sufficiency as a distinct requirement, separate from novelty and inventive step, and assessed whether the patent’s disclosure enabled the skilled person to carry out the invention across the scope of the claims.
For infringement, the court first addressed claim construction. It referenced the Catnic/Improver approach and the impact of Eli Lilly, which in Singapore jurisprudence informs how courts interpret claim language purposively, including whether variants can fall within the claim where the language is not strictly literal. The court then interpreted the terms “work surface” and “texturized work surface”. These terms were central because the accused pads’ surface condition and texture could affect whether the microelements at the relevant interface were exposed to the working environment and whether the pad behaved as the patent describes.
The court also considered whether “new, as-received and unconditioned” pads could fall within the asserted claims. This is a practical issue in CMP pad litigation: some claimed features may only manifest after conditioning, wear, or exposure to slurry. The court’s analysis therefore had to determine whether the claim scope covers pads at the time of sale (before use) or only after they have been conditioned or worn. The judgment’s structure indicates that the court analysed infringement both for three tested NexPlanar pads and for nine untested pads, which required careful reasoning about whether testing results could be extrapolated to other models.
Finally, the court addressed whether the defendants could be regarded as joint tortfeasors. This required considering the relationship between the defendants’ supply and the customers’ use. In some infringement contexts, liability may extend beyond direct manufacture or sale to those who participate in the infringing acts. The judgment’s outline indicates that the court considered whether the defendants might be liable as joint tortfeasors with the customers of the second defendant, which would depend on the degree of participation, knowledge, and the legal characterisation of the customers’ acts in the overall infringement scheme.
What Was the Outcome?
The High Court’s decision resolved both the infringement allegations and the defendants’ counterclaim for revocation. The judgment’s detailed structure—covering novelty, inventive step, sufficiency, and infringement—shows that the court proceeded claim-by-claim and issue-by-issue, rather than treating the case as a single omnibus dispute. The outcome therefore depended on the court’s findings on whether the asserted claims were valid and whether the accused NexPlanar pads fell within the properly construed claim scope.
In practical terms, the decision would determine whether the plaintiff retained enforceable rights (despite the patent’s eventual expiry) for the relevant period, and whether the defendants’ sales and dealings were actionable. It also clarified how courts in Singapore approach technical claim interpretation, particularly where surface texture, exposure to slurry, and wear dynamics are integral to the claimed invention.
Why Does This Case Matter?
This case matters because it demonstrates the Singapore court’s methodical approach to patent disputes involving complex semiconductor manufacturing technology. CMP pads are highly technical products, and the claimed invention’s novelty and inventive step were tied to how microelements behave at different layers of the pad as the pad wears. The judgment therefore provides a useful template for lawyers and law students on how courts translate technical evidence into legal findings on anticipation, obviousness, and sufficiency.
From a doctrinal perspective, the decision is also instructive on confidentiality and prior disclosure. The court’s engagement with whether Intel owed an express or implied obligation of confidence, and whether industry communications (including conferences and brochures) amounted to commercial disclosure, highlights that novelty analysis is not limited to published documents. It also depends on the legal characterisation of disclosures in industrial collaborations and the evidential basis for confidentiality.
For practitioners, the infringement analysis is equally valuable. The court’s focus on claim construction—especially “work surface” and “texturized work surface”—and on whether unconditioned pads can infringe, will be relevant to future cases where the accused product’s functional characteristics depend on use, wear, or conditioning. Additionally, the discussion of joint tortfeasor liability provides guidance on how supply and downstream use may be assessed in infringement-related tort frameworks.
Legislation Referenced
Cases Cited
Source Documents
This article analyses [2017] SGHC 310 for legal research and educational purposes. It does not constitute legal advice. Readers should consult the full judgment for the Court's complete reasoning.