Oppositions at the EPO

Our patent attorneys have years of experience advising on and representing clients in opposition proceedings and appeals before the EPO. Oppositions are a commercially astute method for revoking others’ patents as an alternative or addition to court proceedings.

Oppositions activity

We can:

  • attack and defend patents across all sectors and technologies
  • pursue appeals following EPO first instance decisions
  • attend hearings on clients’ behalf at the EPO

Dispute strategy

We can:


advise on oppositions as part of a wider dispute strategy


monitor and formulate strategies for dealing with competitors’ patents


We can also:


advise on pre-grant strategy including third party observations


challenge patent validity post-grant in national courts, working with your original advisors and/or our solicitors/lawyers




We work across these sectors and more:

  • Aeronautical engineering
  • Aerospace engineering
  • Agriculture
  • Automotive
  • Biotechnology
  • Chemical
  • Cleantech
  • Construction
  • Defence
  • Electronics
  • Food
  • IT/Software
  • Materials
  • Manufacturing
  • Mechanical/Engineering
  • Medical devices
  • Nanotechnology
  • Oil & Gas
  • Optical technologies
  • Pharmaceutical
  • Semiconductors
  • Telecommunications


Get in touch to discuss a dispute strategy appropriate to your situation at oppositions@marks-clerk.com.

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