Virgin Atlantic Airways Ltd v Delta Air Lines Inc

Factual and Procedural Background

This appeal arises from a judgment of Judge Arnold dated 30th November 2010, concerning a patent infringement claim involving the Plaintiff and Defendant. The Plaintiff holds a patent (EP (UK) 1 495 908) which was previously found valid and infringed by a third party, Company A, in relation to aircraft seat "ship-sets" sold to the Defendant. The patent claims were subsequently amended during opposition proceedings at the European Patent Office, deleting claims to a seat unit and retaining claims only for a "passenger seating system for an aircraft". The Plaintiff sued the Defendant, alleging joint infringement with Company A, but the Defendant sought summary judgment following the amendment, arguing that Company A did not infringe the amended patent. The trial judge granted summary judgment in favor of the Defendant, dismissing the Plaintiff's infringement claim.

The Defendant accepted that if Company A infringed the amended patent, it would be liable as well, but disputed infringement on various grounds. The aircraft seats in question, known as Solar Eclipse, are manufactured by Company A in Wales and supplied as ship-sets to customers including the Defendant. The Defendant accepted certain factual findings made by the trial judge regarding the assembly instructions, the bespoke nature of the assembly, and the manner in which the seats are assembled and inspected prior to installation on aircraft.

Legal Issues Presented

1. Whether Company A's acts within the UK fall within the scope of the amended patent, specifically whether the patent claim covers a ship-set before installation on an aircraft.
2. Whether the manufacture and sale in the UK of a complete kit of parts to assemble a patented device can constitute infringement.
3. Whether the manufacture in and export from the UK of an incomplete kit of parts for assembly abroad of a patented device can constitute infringement.

Arguments of the Parties

Appellant's Arguments

• The Plaintiff argued that the opening words of the claim "a passenger seating system for an aircraft" should be construed as covering a system suitable for installation on an aircraft, i.e., a ship-set, regardless of actual installation.
• The Plaintiff relied on established patent law principles that claims "for" a purpose are generally construed as "suitable for" that purpose, supported by multiple authorities and the European Patent Office (EPO) Guidelines.
• The Plaintiff contended that the claim language indicating components "adapted for attaching" to the aircraft floor and "arranged to be disposed" adjacent to aircraft sidewalls supported a construction focusing on capability rather than actual installation.
• The Plaintiff rejected the Defendant's argument that certain claim elements necessitated actual installation on an aircraft, arguing that these elements were inconclusive and that purposive construction favored the Plaintiff's interpretation.
• The Plaintiff also countered the Defendant's redundancy argument regarding dependent claims, explaining that different seat arrangements could coexist under the claims without redundancy.
• The Plaintiff challenged the trial judge's view that their construction failed the certainty requirement under the Protocol to Article 69 of the EPC, arguing that the skilled reader would understand the claim to cover realistic complete systems.

Appellee's Arguments

• The Defendant argued that the patent claim required actual assembly of the seating system on an aircraft, not merely a system capable of being fitted.
• They pointed to claim elements requiring seat units to be arranged in specific spatial relationships (forming a column, disposed adjacent to aircraft sidewalls at an acute angle) as only being satisfied once installed on an aircraft.
• The Defendant contended that the invention's purpose was space-saving on an aircraft, which could not be achieved absent installation.
• The Defendant raised a redundancy argument that claim 2 would be redundant if claim 1 covered a system merely capable of installation.
• The Defendant did not contest the principle that manufacture of a complete kit in the UK could infringe but maintained that manufacture and export of an incomplete kit could not.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
Adhesive Dry Mounting v Trapp (1910) 27 RPC 341	Interpretation of claims using "for" as meaning "suitable for".	Supported the presumption that claims "for" a purpose cover products suitable for that purpose.
Instituform v Inliner [1992] RPC 83	Claim construction principles regarding purpose clauses.	Reinforced the interpretation of "for" as "suitable for" in patent claims.
Bühler v Satake [1997] RPC 232	Claim interpretation relating to suitability for a stated purpose.	Affirmed the approach to construing claims with purpose limitations.
Coflexip v Stolt [2000] EWCA Civ 242	Claim construction and understanding by the skilled person.	Applied principles of purposive construction consistent with suitability interpretation.
FNM v Drammock [2009] EWHC 1294 (Pat)	Construction of patent claims involving purpose clauses.	Supported the "suitable for" interpretation of claims.
Zeno Corp v BSM-Bionic [2009]	Interpretation of claims and skilled person understanding.	Affirmed the general rule that "for" means "suitable for".
Du Pont's Application [1984] R.P.C. 17	Claim construction regarding product suitability.	Referenced to support the general rule of claim interpretation.
Furr v. Truline [1985] F.S.R. 553	Interpretation of claims with purpose limitations.	Reinforced the principle of construing "for" as "suitable for".
Visx v Nidek [1999] F.S.R. 405	Claim construction on purpose clauses.	Supported the established principle of suitability interpretation.
Vericore v Vetrepharm [2003] EWHC 1877 (Ch)	Claim construction principles relating to intended use.	Supported the interpretation of claims with "for" language as indicating suitability.
Corevalve v Edwards Lifesciences [2009] EWHC 6 (Pat)	Claim construction and skilled person perspective.	Applied principles consistent with the "suitable for" interpretation.

Court's Reasoning and Analysis

The court began by reviewing the trial judge's summary judgment decision, which found no realistic prospect of the Plaintiff establishing infringement of the amended patent by the Defendant. The trial judge held that the patent claims required an assembled seating system installed on an aircraft, which was not the case as assembly occurred abroad. The court identified three main issues: the scope of the amended patent claims, the potential infringement by manufacture and sale of kits in the UK, and infringement by manufacture and export of incomplete kits.

The court accepted that the second and third issues raised complex legal questions better suited for trial rather than summary judgment, especially given unsettled law across Europe and the fact-sensitive nature of kit completeness.

The court focused on the claim construction issue, applying established principles from Kirin-Amgen: the claim language must be understood from the perspective of the skilled person, considering the patent as a whole and purposive construction.

The court found a strong presumption that claims "for" a purpose mean "suitable for" that purpose, supported by multiple authorities and EPO Guidelines. The court rejected the trial judge's narrower construction requiring actual installation on an aircraft, noting that the claim language, including terms like "adapted for attaching" and "arranged to be disposed," indicated capability rather than actual installation.

The court also found that the alleged contradictions in certain claim elements were inconclusive and cautioned against over-meticulous verbal analysis, favoring purposive interpretation. Subsidiary claims and arguments about redundancy did not compel a different construction.

The court disagreed with the trial judge's concern about uncertainty for third parties, concluding that the skilled reader would understand the claim to cover realistic complete systems suitable for installation.

Finally, the court distanced itself from a paragraph in the trial judgment concerning the skilled reader's knowledge of wider patent law principles, as it was not part of the claim construction reasoning.

Holding and Implications

The court allowed the appeal. The court held that the amended claim 1 covers a passenger seating system capable of being installed on an aircraft (i.e., a ship-set), not limited to a system already installed on an aircraft. Consequently, the summary judgment of non-infringement was set aside, and the case was remitted for trial to consider other non-infringement points raised by the Defendant.

The decision directly affects the parties by reinstating the Plaintiff’s infringement claim against the Defendant, but it does not establish new precedent beyond clarifying the construction of the patent claim in this context. The court emphasized that complex legal questions concerning kit infringement are better resolved at trial with full factual development.