This revised version of the Guidelines for Examination will apply as from 1 November 2015. Until then, the September 2014 edition of the Guidelines remains valid.

2. Allowability of amendments under Art. 123(2)

2.2Field of application of Art. 123(2)

The underlying idea of Art. 123(2) is that an applicant is not allowed to improve his position by adding subject-matter not disclosed in the application as filed, which would give him an unwarranted advantage and could be damaging to the legal security of third parties relying on the content of the original application (see G 1/93).

  An amendment should be regarded as introducing subject-matter which extends beyond the content of the application as filed, and therefore unallowable, if the overall change in the content of the application (whether by way of addition, alteration or excision) results in the skilled person being presented with information which is not directly and unambiguously derivable from that previously presented by the application, even when account is taken of matter which is implicit to a person skilled in the art (see G 2/10). At least where the amendment is by way of addition, the test for its allowability normally corresponds to the test for novelty given in G‑VI, 2 (see T 201/83).

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