Pozzoli Spa v BDMO SA & Anor

Factual and Procedural Background

The Appellant, the patentee of UK patent EP 0 676 763, seeks permission to appeal a decision by the trial judge that the patent is invalid. In the event permission is granted and the patent upheld as valid, the Appellant also appeals the finding that the Defendant's product, the "Double Push Tray," does not infringe the patent. The patent concerns a container for multiple discs, particularly compact discs, designed to reduce the external dimensions compared to prior art containers. The trial court found the patent invalid for obviousness and held that the Defendant's product did not fall within the patent's scope.

Legal Issues Presented

1. Whether permission to appeal should be granted despite the patent being held invalid at first instance.
2. The effect of the TRIPS Agreement on the criteria for granting permission to appeal in patent revocation cases.
3. The proper approach to construing the inventive concept of the patent claim for the purposes of assessing obviousness.
4. Whether the patent claim is invalid for obviousness over the prior art, including the "2-to-1" container shape and the Fujifilm floppy disk container.
5. The proper construction of the patent claim terms, particularly "axially retained" discs and the meaning of "regions" located at different heights.
6. Whether the Defendant's product infringes the patent claim based on the claim construction.

Arguments of the Parties

Appellant's Arguments

• Permission to appeal should be granted based on the TRIPS Agreement, which requires an opportunity for judicial review of patent revocation decisions regardless of prospects of success.
• The patent discloses a novel container design overlapping discs without intermediate protection, overcoming a technical prejudice against overlapping discs.
• The trial judge erred in identifying the inventive concept and in rejecting the existence of a prejudice against overlapping discs.
• The evidence accepted by the judge was tainted by hindsight, as the idea of reducing container height by overlapping discs would not have been obvious without the invention.
• The Defendant's product infringes the patent because the discs are "axially retained" even though retention is at the edges rather than by a central rosette.
• The term "region" in the claim should be understood as a virtual space occupied by the disc, not necessarily physically at different heights.

Defendant's Arguments

• The TRIPS Agreement does not displace the established test for permission to appeal requiring a real prospect of success.
• The patent is invalid for obviousness as the idea of overlapping discs to reduce container height was obvious to a skilled person.
• The trial judge correctly identified the inventive concept and found no technical prejudice against overlapping discs.
• The Defendant's product does not infringe because the discs are not retained axially in the manner claimed, and the claimed "regions" must be physically at different heights.
• Prior art, including the Fujifilm floppy disk container, anticipates or renders obvious the claimed invention.

Table of Precedents Cited

Court's Reasoning and Analysis

The court first addressed the Appellant's argument based on the TRIPS Agreement, rejecting the submission that TRIPS mandates granting permission to appeal despite no real prospect of success. The court held that a judicial decision to deny permission to appeal constitutes the "judicial review" required by TRIPS, and the treaty does not prohibit preliminary screening for merit.

On permission to appeal, the court found that the Appellant's arguments on validity and construction justified granting permission on the conventional basis of a real prospect of success.

The court then reviewed uncontested principles, emphasizing the proper approach to claim construction, deference to primary fact-finding, and the cautious appellate approach to obviousness.

Applying the Windsurfing test, the court elaborated the steps as: (1) identifying the skilled person and their common general knowledge; (2) identifying or construing the inventive concept; (3) identifying differences over prior art; and (4) assessing obviousness of those differences.

The court accepted the trial judge's identification of the skilled person as someone involved in packaging discs and summarized the agreed common general knowledge including known container types and retention methods.

The court rejected the Appellant's claim of a technical prejudice against overlapping discs, concluding that no such prejudice existed and there was no long-felt want for the invention at the priority date.

Regarding the inventive concept, the court found it to be the overlapping, spaced apart, and individually removable arrangement of discs held by their centers in a stepped configuration. The court noted that the Appellant's broader description of the concept was too wide and that the trial judge's narrower formulation was appropriate.

The court agreed that the difference over prior art was the overlapping and spacing of discs rather than side-by-side or concentric arrangements.

On obviousness, the court rejected the Appellant's arguments that the trial judge erred by ignoring prejudice or hindsight. The court found the overlapping arrangement obvious to a skilled person seeking to reduce the height of the known 2-to-1 container shape.

The court also considered prior art from the Fujifilm floppy disk container disclosing overlapping discs, concluding that adapting this for CDs with conventional retention would have been obvious.

On infringement, the court construed "axially retained" to mean discs held by a coupling element acting along the disc's axis, as shown by the conventional rosette in the patent. The Defendant's product, which retains discs at the edges, did not meet this requirement.

Regarding the claim requirement of "regions" at different heights, the court held that these must be physical regions at distinct levels, consistent with the patent drawings and specification. The Defendant's product lacks such stepped regions.

The court noted that the French court had reached similar conclusions on infringement and claim construction, while the German court had taken a broader view on axial retention, which the court disagreed with.

Consequently, even if the patent were valid, it would not be infringed by the Defendant's product.

Holding and Implications

The court DISMISSED the appeal. Permission to appeal was granted, but the patent was held invalid for obviousness and, alternatively, not infringed by the Defendant's product based on claim construction.

The direct effect is that the patent remains revoked and the Defendant's product is not infringing under the patent claims as construed. The decision does not establish new legal precedent but clarifies the application of existing principles on permission to appeal under TRIPS, claim construction of "axially retained" discs, and the treatment of technical prejudice in obviousness analysis.