d) Drafting of disclaimers – delimitation against any potential prior art 

In T 285/03 the board found that the interpretation offered by the appellant amounted to a disclaimer although it was not phrased in the usual form. However, that disclaimer was not based on a particular prior art disclosure, whether accidental or not, but tried to delimit the claim against any potential prior art disclosure, contrary to the principles set out in G 1/03.