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1 April 2013AmericasJane Wainwright and Daniel Young

Post-grant patent challenges in Europe and the US: harmony at last?

Post-grant challenge in Europe

European Patent Office (EPO) opposition represents an important part of the toolbox for dealing with competitors’ patents. An opposition can knock out a competitor’s patent for a relatively low cost and can, in many European countries, even lead to a stay of parallel national infringement proceedings. Figures from the EPO also show that approximately two thirds of oppositions result in revocation or amendment of the opposed patent.

Despite the commercial advantages of filing an opposition, they are underused. Th e proportion of oppositions filed against granted patents in any given year is only around 5 percent (4.74 percent in 2011), with more life sciences patents being opposed than other technology areas such as electronics (7 percent for biotechnology compared to 2 percent in each of telecommunications and computer technology).

EPO opposition versus national litigation

A European patent, once granted, results in a bundle of separate national patents. Any challenge to the validity of a European patent via the court system must be made in each national court as a separate action. Undertaking multiple challenges, each in front of a different national court, can quickly become time-consuming and expensive. Courts in different countries can also come to different decisions, potentially resulting in a patent being valid in some European countries but not in others.

“THE ACTUAL BENEFITS OF POSTGRANT REVIEW REMAIN TO BE SEEN, BUT IT IS CLEAR THAT THERE ARE MORE OPTIONS FOR CHALLENGING PATENT VALIDITY AND AVOIDING AN INFRINGEMENT RISK.”

An EPO opposition, on the other hand, allows a centralised challenge to the validity of a European patent with the outcome applying to all of the separate national patents that resulted from grant of a European patent. A successful opposition resulting in invalidity cannot be challenged in a national court but, if an EPO opposition is unsuccessful, the opponent is still able to challenge validity nationally and the opposition ruling itself is not binding on any national court.

The centralised approach of an opposition reduces the amount of work that is required. There is no duplication of efforts by lawyers in multiple countries nor is there the need for multiple translations. Furthermore, the evidential requirements of the EPO are lower than those of a national court, with no discovery and only sporadic use of witnesses.

Due to these more streamlined procedures, the typical costs incurred during the whole opposition ($15,000 to $75,000) are lower than the cost of conducting a single national court action, and often significantly so.

Particular advantages for life sciences

Each opposition, irrespective of technology area, is decided on its own facts for each of the grounds of opposition that are raised. However, oppositions in the life sciences arena are often able to take advantage of the strict EPO practice in relation to lack of enablement, obviousness and unallowable amendment.

A common attack in the life sciences is that, due to the exemplification of the patent being limited to one or very few examples (eg, exemplification of only one antibody but claims directed to antibodies more broadly), the claimed invention does not solve the technical problem leading to both obviousness and enablement issues.

EPO oppositions are heard by an Opposition Division (OD) including two members who are technically qualified. As life science patents commonly involve complex scientific concepts and methods, the technical members of the OD oft en bring an insight that is not always possible during court proceedings.

Post-grant challenge in the US

In the US, validity of a patent may be challenged in a Federal court or before the Patent Trial and Appeal Board (PTAB) of the US Patent and Trademark Office (USPTO). The PTAB will review the challenge and decide whether the claims represent a bona fide invention or are unpatentable, in which case the rejected claims will be cancelled from the patent, or must be amended to be patentable.

The Leahy-Smith AIA

Under the America Invents Act (AIA), procedures were implemented to make postgrant challenge faster, expand the role of a third party challenger, and expand what grounds of invalidity can be re-considered by the PTO.

Under the AIA, the previous inter partes reexamination has been replaced with two procedures: inter partes review and post-grant review. Both options are initiated by a third party challenging the validity of an issued patent. However, there are notable differences. For example, post-grant review must be requested within nine months of issuance and allows almost any type of defect in a patent to be the basis for a challenge, including challenging the scope and clarity of claims.

In contrast, inter partes review is limited to challenges based on prior art documents and whether patent claims can be distinguished from those prior art documents.

Particular advantages for life science

For any company facing an infringement risk, challenging a patent before the PTO is likely to be an attractive option. However, one of most significant features for the life sciences is the expanded basis for validity challenges, which includes issues of claim scope under the post-grant review procedure.

Life sciences patents often contain claims encompassing large classes of therapeutic agents while exemplifying only a limited number, thereby rendering such claims vulnerable to attack on the basis that their scope is too broad. Pre-AIA, such an attack could only be made through expensive litigation in the federal courts.

Post-grant review may also prove cost-effective as part of a life sciences business model, for instance challenging issued patents of competitors, or as leverage to secure licences. Non-profit organisations may choose to challenge biotechnology patents to advance a public policy agenda.

Further, the USPTO is expanding its pool of administrative patent judges to increase efficiency. The pool includes past examiners, former patent litigators and others with expertise in life science patent cases. Consequently, cases will probably be handled by judges with appropriate technical backgrounds for understanding concepts unique to the life sciences. Therefore a challenge before the PTAB may be a better option than in the federal courts, where judges and juries often have limited technical training.

The future of post-grant patent challenges

In Europe, the use of EPO oppositions to challenge competitor patents brings benefits for opponents reaching beyond any successful opposition. The forthcoming Unitary Patent Court (UPC) will eventually bring a centralised court-based approach to invalidity in Europe that should broadly resemble the current opposition system. At the time of writing, the timeline for full implementation of the UPC is expected to be a minimum of seven years. Experience gained by using the EPO opposition system in the meantime will prove useful when the UPC finally comes into force.

In the US, the procedure for conducting an inter partes review applies to any patent; the postgrant review applies only to patents issuing from applications filed after March 16, 2013. The actual benefits of post-grant review remain to be seen, but it is clear that there are more options for challenging patent validity and avoiding an infringement risk, without costly litigation in federal courts.

In both Europe and the US, post-grant challenges are an attractive option for parties to minimise the expense of patent litigation. With expanded options for post-grant challenge in the US and some level of alignment with oppositions in Europe, companies may increasingly choose to use both procedures as part of their overall IP strategy.

Jane Wainwright is a partner in the life sciences group at Potter Clarkson LLP. She can be contacted at: jane.wainwright@potterclarkson.com

Daniel W Young is an associate in the life sciences group at Wolf, Greenfield & Sacks, PC. He can be contacted at: dwyoung@wolfgreenfield.com