Patent – Infringement. The claimant owned a patent, referred to as a 'mailer', which was a form, letter or other type of business communication, which was folded, sealed with an adhesive and then sent through the post. It alleged that the defendants had infringed the patent by making and disposing mailers falling within the claims of the patent. The proceedings were stayed in respect of the second to fifth defendants. The Intellectual Property and Enterprise Court held, in respect of the first defendant, that the patent was invalid for lack of novelty over one item of prior art and for lack of inventive step over two items of prior art.