< Back to latest news & events

Knowledge Hub

Co-Existence Agreements – The importance of getting them right

June 2020

A co-existence agreement allows businesses to trade using the same (or similar) mark, but with certain agreed restrictions, such as geographical constraints where a mark can be used. For example – one party may be able to sell under the mark in Europe, and another can sell under the mark in the USA. The need for this may arise for example where two parties have unknowingly adopted the same mark at the same time.

The recent case of Merck KGaA v Merck Sharp & Dohme Corp and Ors [2020] EWHC 1273 (Ch) concerned a long running trade mark dispute between Merck KGaA (Merck Global) and Merck Sharp & Dohme Corporation (Merck US) and illustrates the importance of making sure co-existence agreements are fit for purpose.

Background

Merck Global was founded in 1688 in Germany. A US subsidiary was established that subsequently became an independent company. A co-existence agreement was entered into in 1955 and then updated in 1970, which set out the parties use of the mark ‘Merck’. This agreement provided that Merck US were fine to use this mark in the US and Canada, however in other countries they would use ‘Merck Sharp & Dohme’ (the company’s full name).

Infringement

Merck Global claimed that online and offline uses of ‘Merck’ in the UK by Merck US breached the co-existence agreement between the parties. In 2016, the High Court found that Merck US’ use of the mark in the UK constituted a breach of the co-existence agreement. Merck US appealed, and the Court of Appeal found in 2017 that Merck US had breached the agreement. The issues of whether these breaches constituted trade mark infringement were referred back to the High Court.

The judge found that Merck US’ use of the mark on websites, email addresses and social media targeted at the UK could constitute “use in the course of trade” (i.e. – physical goods do not actually have to be available, given the fact that Merck US had used a different mark on products actually sold in the UK) and accordingly use in this way constituted trade mark infringement. An injunction was granted against Merck US to prevent it from infringing the mark in the UK.

How can a business get this right?

Ensuring that a co-existence agreement will adequately deal with every eventuality that may arise in the future is obviously impossible. However, the co-existence agreement in this instance appeared to be very simple and had not been updated since 1970 (and consequently could never deal with issues such as whether use on social media constituted infringement). Parties to such an agreement should therefore think about the following;

  • What effect could rapidly evolving technology have on the use of a mark in future. Could this widen the use of a mark, sometimes inadvertently beyond the scope of what was originally intended?
  • Where do you realistically intend to sell products? Basing an agreement on current markets and ignoring potential markets could cause problems down the line.
  • Include adequate dispute resolution processes (for example a requirement to mediate a dispute) in order to hopefully avoid costly and lengthy litigation.
  • Given this case and the effects of the internet and other technology, it may be worthwhile introducing requirements for the agreement to be reviewed (for example every ten years) to make sure it adequately provides for such advancements or changes to the parties’ businesses
  • Don’t just consider geography – consider all elements of hard copy and electronic use including social media, websites, physical marketing brochures and other advertising materials.

This article was prepared by HGF Senior IP Solicitor Chris Robinson. If you would like further advice on this or any other matter, please contact Chris.  Alternatively, you can contact your usual HGF representative or visit our Contact page to get in touch with your nearest HGF office.

Latest updates

Event - 24th June 2026

IP Clinic for SMEs at ETZ EnergyWorks

Following the success of our first session, we’re pleased to announce our next Intellectual Property (IP) clinic taking place at ETZ EnergyWorks in Aberdeen on Wednesday 24 June 2026, from …

Event details
Event - 2nd June 2026

HGF are proud sponsors of Retail Week General Counsel 2026

HGF is proud to be sponsoring Retail Week General Counsel. This will take place on Wednesday 3rd June at Ham Yard Hotel. The retail legal landscape is undergoing a fundamental …

Event details
Event - 5th May 2026

IP Clinic for SMEs at ETZ EnergyWorks

We’re pleased to announce a free Intellectual Property (IP) clinic taking place at ETZ EnergyWorks in Aberdeen on Wednesday 27th May, from 11.00am to 4.00pm, designed to support SMEs in …

Event details
Event - 11th - 12th May 2026

HGF is proud to be attending the 14th Microbiome R&D and Business Collaboration Forum: Europe 8th Skin Microbiome and Cosmeceuticals Congress: Europe.

HGF is proud to be attending the 14th Microbiome R&D and Business Collaboration Forum: Europe 8th Skin Microbiome and Cosmeceuticals Congress: Europe. It will be held on Monday 11-12th May …

Event details
Event - 27th April 2026

HGF are proud to be Gold Sponsors of IP Counsel Café

HGF are proud to be Gold Sponsors of IP Counsel Café on 12-14th May at Silicon Valley, US. HGF Partner Susan Keston will be speaking at on the topic AI …

Event details
Event - 16th April 2026

MedTech Innovation Summit 2026

HGF Partner and Patent Attorney Adam Hines will be attending the MedTech Innovation Summit Dublin 2026, taking place from 28–30 April at The Shelbourne Hotel. As one of Europe’s premier …

Event details
Event - 2nd - 6th May 2026

INTA 2026 Annual Meeting

HGF’s European team are delighted to be attending the INTA Annual Meeting 2026, taking place from 2nd-6th May in London. As one of Europe’s leading IP firms, HGF brings together …

Event details
Event - 25th March 2026

HGF Women IP Inclusive Event

HGF are hosting Connected Bubbles Networking Event on Wednesday 25 March 2026 and this year they are teaming up with CIPA! In a profession built on collaboration, referrals and trusted …

Event details