480. Mindset of skilled person.

In addition to his common general knowledge1, the skilled addressee will approach the prior art with the perspective and expectations of those in the relevant field as at the priority date of the invention: for example, there may be an established prejudice that something will not work or that something ought not to be done and the fact that the patentee has demonstrated that, contrary to the mistaken prejudice, something will work and is successful, points to there being an inventive step