More Guidance on Claiming Priority

More Guidance on Claiming Priority

EPO Decision T1201/14 of 9 February 2017 was published on 5 September 2017 and provides further guidance on the issue of priority. The case is an appeal against an opposition which revoked the patent on grounds of lack of novelty. In the Opposition, the OD found no...
EPO Boards of Appeal Approach to Partial Priorities

EPO Boards of Appeal Approach to Partial Priorities

The applications relate to compositions for dental impression materials. Claim 1 of the granted patent read as follows: “A dental impression material comprising a base paste and a catalyst paste, wherein the base paste comprises at least one polymerizable...
T 1852/13 – An End to the ‘Essentiality Test’?

T 1852/13 – An End to the ‘Essentiality Test’?

Background The EPO’s Boards of Appeal have previously used the ‘essentiality test’ to determine whether after the deletion of a claim feature the remaining subject-matter is still in compliance with the content disclosed in the application-as-filed....