You are here: Home > News > EPO revokes Broad’s CRISPR-Cas9 patent

EPO revokes Broad’s CRISPR-Cas9 patent

18 January 2018

This week saw the first decision from the EPO Opposition Division related to the CRISPR-Cas9 genome editing technology.  The patent in question, EP2771468, which was granted to the Broad Institute, MIT and Harvard University was revoked after the filing of nine oppositions.

The PCT application from which EP2771468 derived was filed naming Broad, MIT and Harvard University as Applicants and claiming priority from twelve US provisional applications, some of which named the inventors as Applicants.

The Opposition Division held that the right to claim priority in respect of four of the provisional applications had not been correctly assigned from the inventors named on the provisional applications to the Applicants named on the PCT application.

Consequently, the claims were found to lack novelty over a number of documents which, as a result of the invalid priority claim, became relevant prior art.

The Broad Institute immediately released a statement indicating that they intend to appeal the decision.


Kirsty Simpson
Life Sciences & Chemistry group

If you require further information on anything covered in this briefing, please contact Kirsty Simpson (; 44 20 7940 3600) or your usual contact at the firm. This publication is a general summary of the law. It should not replace legal advice tailored to your specific circumstances.

© Withers & Rogers LLP, January 2018