In December 2013, ASSIA (Adaptive Spectrum and Signal Alignment, Inc.) brought an action against BT (British Telecommunications Plc.) for infringement of two of its European (UK) patents (EP2259495 and EP1869790). Specifically, ASSIA alleged that BT’s so-called Rate Adaptive Management Box, or RAMBo, part of BT’s dynamic line management system, infringed its patents, which relate to methods of managing various transmission parameters used in DSL systems.
In a typical DSL system, communication between an end user and an internet service provider is carried out between a modem located at the end user’s home or premises and a modem located in a street cabinet or telephone exchange. The two modems must use a common protocol with commonly defined parameters to communicate. It is these parameters that the RAMBo, and the methods of ASSIA’s patents, dynamically manages.
In the High Court, Mr Justice Birss found the ‘495 patent valid, but not infringed by any of BT’s systems, and the ‘790 patent both valid and infringed by the RAMBo in BT’s NGA system. NGA, or Next Generation Access, is the name given to BT’s fibre-optic broadband offerings, covering both retail and wholesale services. Both parties appealed.
On appeal, the Court confirmed that the ‘790 patent was both valid and infringed, but found that the ‘495 patent was, in fact, also infringed by the NGA RAMBo. As the parties were unable to agree on a final order, the Court of Appeal provided judgement on its terms.
After the appeal, BT faced the possibility of a new injunction as a result of the substituted finding of infringement of the ‘495 patent. The infringing RAMBo devices are located in each of the telephone exchanges that have been upgraded to provide BT’s NGA services, and are used to provide service to every end user of both BT’s own fibre-optic NGA broadband offerings and re-sold BT Wholesale services. This is, obviously, a large number of infringing devices, a large portion of BT’s UK-based customers and revenue, and a large part of the UK’s internet-using public.
BT sought a stay of the injunction on the ‘495 patent to enable it to make alterations to its systems to render them non-infringing.
In the judgement on the final order, Lord Justice Floyd commented that in the absence of a pending appeal to the Supreme Court (permission for which had been refused by the Court of Appeal) an injunction would normally be granted. However, the Court was “narrowly persuaded” that, since ASSIA’s business lies primarily in licensing its inventions and given its interest primarily in a financial remedy, no lasting harm would be inflicted upon ASSIA if BT were granted a stay.
This was coupled with the potential adverse effect on the end users of BT’s NGA system, with Floyd LJ commenting that: “given BT’s large market share, the public would suffer if an injunction were granted disrupting or reducing the quality of the BT service”.
As a condition of the stay, BT was required to pay £250,000 (10% of its estimated weekly revenue from its NGA products) for each week of the stay as an interim payment on account of damages. This was to be repaid to the extent that the amount paid by BT exceeds the damages awarded overall in a subsequent enquiry as to damages.
Floyd LJ also stated that the Court would normally order delivery up of the infringing articles, but in the present case was willing to grant the “less extreme” remedy of an order to render the products and systems non-infringing. BT was, therefore, required to provide an explanation of the steps that it had taken to render its systems non-infringing as a condition of the stay.
BT also requested a cross-undertaking in damages in relation to the final injunction in view of ongoing proceedings before the European Patent Office in respect of the ‘495 patent. The Court rejected BT’s request, stating that a cross-undertaking is appropriate to take account of the possibility that an earlier judgement is wrong; however, revocation or amendment of the ‘495 patent by the EPO would not show the judgement of the Court of Appeal to be wrong. Any such subsequent revocation or amendment would render the injunction ineffective from the date of the revocation or amendment, not ab initio; there would be no reason for ASSIA to pay for any harm to BT in the period when the injunction was rightly granted.
Finally, whilst BT did not apply for a stay of the UK proceedings pending the outcome of the EPO proceedings, the Court commented that had it done so, it was more or less inevitable (following IPCom v Nokia  RPC 12) that as a price of resisting the stay ASSIA would have been required to undertake to repay, in the event of revocation or amendment by the EPO, any financial relief subsequently obtained in the UK proceedings. The Court therefore ordered that ASSIA give such an undertaking, whilst indicating that a stay pending the outcome of EPO proceedings would be refused on the basis of this undertaking.
In this judgement, the Court of Appeal has demonstrated a willingness to impose an injunction on a large telecoms operator. However, in the event that the infringed patent belongs to a business primarily interested in licensing its inventions rather than selling its own products, and where immediate imposition of the injunction is likely to cause the public to suffer, a stay of the injunction to provide time to render the offending articles non-infringing may well be granted.