February 17, 2021

Description Amendments: Upcoming Changes at the EPO and their Risks

The European Patent Office (EPO) is about to release new Guidelines to its Examiners with several changes over the current Guidelines. The changes in Part F, Chapter IV, 4.3 (iii) are particularly worthy of note and are explained in our recent article. These changes equate to a formalising of practices, relating to description amendments, that have become increasingly common in recent years.

This article investigates the possibly unforeseen consequences and risks of these “new” practices and ends with practical points to keep in mind in view of this new risks.

Previous EPO Practice (Nostalgia)

In European prosecution, when the final scope of the claims is agreed, applicants are often requested to bring the description into conformity with the claims. This is to satisfy the requirement of Article 84 EPC: that the claims be supported by the description. Previously, this requirement was considered satisfied by relatively minor amendments. For example, for a large specification, a statement might be added to direct a reader’s attention to the most relevant parts of the description, so readers could quickly comprehend the operation of the invention.

Outside opposition proceedings and rare clashes relating to whether parts of a description were incompatible with claims, this old practice was relatively straightforward.

New EPO Practice (The Twist)

Proposals or requests to make severe description amendments have however become increasingly frequent in recent years. It is also increasingly common to see proposed, or requested, amendments that while unobjectionable from a prosecution viewpoint have the potential to cause problems for applicants down the line (after grant). An example of such an amendment is the insertion of the phrase “the preamble of claim 1 is disclosed in [D1]”.

Generally, EPO practice is characterized by a claim-centric approach. Indeed, European prosecution often requires definitions from the description to be added to the claims so the claims can be understood without any reference to the description. It is therefore surprising to see the new Guidelines commit so strongly to this increased focus on the description.

Infringement and Equivalents

Outside the remit of the EPO, in infringement proceedings of EPC states, the description is very important. In accordance with Article 69(1) EPC, the description and figures shall be used to interpret the claims and thereby derive the extent of protection. Some EPC states also have doctrines of equivalents and the extent of these may be at least partly defined by the description.

For example, since the UK Supreme Court’s Actavis decision in 2017, the UK has a doctrine of equivalents. The limits of this doctrine are still being defined by UK case law. However, the Actavis decision itself made clear that the prosecution history (including description amendments) will be considered if the “patentee had made it clear to the EPO that he was not seeking to contend that his patent, if granted, would extend its scope to the sort of variant which he now claims infringes”. An example of such consideration is found in the 2020 Akebia vs Fibrogen decision, in which Lord Justice Arnold used an amendment in prosecution as one of several reasons to limit the scope of equivalents. This decision also noted the following principle from German case law:

“If the description discloses a plurality of possibilities for achieving a specific technical effect, but only one of those possibilities is catered for in the patent claim, the utilisation of any of the other possibilities properly does not constitute infringement of the patent with equivalent means.”

Whilst a similar principle is not binding in the UK (yet) it is an indication of how some in the UK judiciary are thinking about equivalents.

The Risks

Given the above, it is clear the deletion or explicit disclaiming of an embodiment from the description is likely to risk a reduction in the scope of protection afforded by a patent.

The new Guidelines also seem to encourage Examiners to object to subtle description amendments.

To address such objections might require comments to be put on the public register about the potential construction of the patent according to national law. This is something few patentees are likely to want to do – such comments could jeopardize the future assertion of patent families worldwide. 

Practical Points

It is unclear how strictly the new Guidelines will be implemented and how required description amendments will be considered by some national courts. Therefore, it is difficult to make recommendations. The following points are however worth keeping in mind:

  1. An Independent Claim Per Category: Multiple independent claims in the same claim category should be avoided where possible when filing in Europe. It is likely the application will be limited in prosecution to one independent claim per claim category and the alternatives in the description may have to removed or explicitly disclaimed.
  2. Take Care With Alternatives: The inclusion of alternatives when drafting an application for Europe now requires careful consideration. Alternatives may end up being removed or explicitly disclaimed. In such cases, the filed alternatives might amount to publicly disclosed patent workarounds.
  3. Avoid Feature Reservoirs: It might be tempting to draft all features as independent options, so they need not be removed if a particular embodiment no longer falls under the claim scope. We recommend resisting this temptation because this practice is strongly opposed by many European examiners who prefer unambiguous identification of embodiments of the invention. Patents drafted with a such a “reservoir of features” also tend to run into added matter and inventive step objections.
  4. Do Not Add Matter: The strict European added matter standard applies as rigorously to the description as to the claims. Redrafting of portions of the description or any adjustment that adds new teachings will likely be considered to add matter.
  5. Description Amendments May Be Final: Changing the description often affects the scope of protection by affecting claim construction. Therefore, in opposition or national revocation proceedings, correcting description amendments to remove added matter may be blocked – forming a trap that will inevitably lead to the revocation of the patent.
  6. Expect Trouble: Applicants should appreciate that EPO proposed description amendments may be formed without consideration of the post grant ramifications. It may be in an applicant’s best interest, especially in crowded or contentious fields, not to accept proposed description amendments. Alas, increased arguments and delays over description amendments are expected.
  7. Consider Divisional Applications: If an alternative in the description is identified as falling outside the scope of the claims and the alternative is commercially relevant, a divisional application should be used to ensure the alternative is protected. Relying on doctrines of equivalents or broad constructions being adopted in national courts to cover potential infringements is not recommended.
  8. Acquiescence Entails Risks: The time taken to review proposed amendments in a text intended for grant or to amend the description will increase with the severity of amendments. Applicants facing severe description amendments who wish to keep costs to a minimum, or to expedite grant, should expect that realizing their aims may entail risks to validity and/or reduction in the breadth of protection that is achieved.

The Good News

If the new Guidelines are enforced without flexibility, it is likely that a lot of appeals will follow and possibly even adverse commentary in national law decisions.

Happily, despite the EPO not considering infringement, most European Examiners are commercially savvy and fully appreciative of the legal pressures on applicants and attorneys. A pragmatic approach to description amendment is hoped for and would seem reasonable, at least until the ramifications of such amendments are fully apparent. Account will also need to be taken of the fact many applications that are currently being prosecuted were filed before the advice of the new Guidelines was available to applicants.

For their part, attorneys should advise clients of the new practices and associated risks. This will help applicants prepare accordingly and hopefully avoid serious problems in the future.

Please contact the author Anthony Kavanagh or one of our HMC-IP attorney team for further advice.

Hanna Moore + Curley


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