T 0015/05 07-09-2006

I. The appeal is from the decision of the Opposition Division posted on 4 November 2004 revoking European patent No. 0 847 738, granted in respect of European patent application No. 97 122 022.3.

Claim 1 as granted reads as follows:

"A disposable absorbent article (20) for being worn by a wearer and, said disposable absorbent article comprising a liquid pervious topsheet (24); a liquid impervious backsheet (26) at least partially peripherally joined to said topsheet; and an absorbent core (28) disposed between said topsheet and said backsheet; and a fecal material storage element (25) intermediate said topsheet and said absorbent core, said fecal material storage element spacing apart at least a portion of said topsheet and said absorbent core so as to permit low viscosity fecal material deposited on the topsheet to be stored in said fecal material storage element characterized in that said fecal material storage element is non-absorbent and liquid-pervious and said fecal material storage element is provided in the form of an apertured formed film, said formed film has a caliper of at least 0,75 mm at a load of 36.1 g/cm**(2)."

II. In the decision under appeal the Opposition Division considered that the subject-matter of claim 1 extended beyond the content of the application as filed. It could only be inferred from the original application that the apertures in the film had a depth of at least 0.75 mm at a load of 31.6 g/cm**(2) (the obviously erroneous value of 36.1 g/cm**(2) recited in claim 1 manifestly resulting from a typing error), not that the film had a caliper of at least 0.75 mm at a load of 31.6 g/cm**(2). There was no clear relation or equivalence between the caliper of an apertured formed film and the depth of the apertures. Even the prior art represented by

D3 : US-A-4 324 247,

distinguished between a "true" caliper, corresponding to the thickness of the film material, and an "embossed" caliper, corresponding to the distance between parallel planes passing through the remotest points at either surface of the film.

III. The appellant (patent proprietor) lodged an appeal, received at the EPO on 23 December 2004, against this decision and paid the appeal fee on the same day. With the statement setting out the grounds of appeal, received at the EPO on 21 February 2005, the appellant filed amended claims in accordance with main and first to fifth auxiliary requests. The claims according to the main request were the same of the claims as granted with the correction of the load of 36.1 g/cm**(2) to 31.6 g/cm**(2).

IV. In a communication accompanying the summons to oral proceedings pursuant to Article 11(1) of the Rules of Procedure of the Boards of Appeal, the Board expressed the preliminary opinion that the amendment of the load of 36.1 g/cm**(2) to 31.6 g/cm**(2) in the claims appeared to be an allowable correction under Rule 88 EPC. However, since no explicit limitations were disclosed in the application as filed for the caliper of the fecal material storage element, it had to be discussed whether the feature of claim 1 according to which the apertured formed film had a caliper of at least 0,75 mm at a load of 31.6 g/cm**(2) could be derived from the disclosure relative to the depth of the apertures. The Board further stated that it appeared that the range for the depth of the apertures was disclosed in the application as filed only in combination with limitations for other dimensions of the apertures which were not recited in claim 1.

V. In response to the preliminary opinion of the Board, the appellant filed with letter dated 7 August 2006 amended claims forming the basis for a new main request and a first auxiliary request of maintenance of the patent in amended form.

Claim 1 in accordance with both requests includes the feature according to which:

"said formed film has a caliper of at least 0,75 mm at a load of 31.6 g/cm**(2)".

VI. Oral proceedings, at the end of which the decision of the Board was announced, took place on 7 September 2006.

The appellant requested that the decision under appeal be set aside and that the patent be maintained on the basis of the main request or the first auxiliary request as filed with the letter dated 7 August 2006. Further it requested that the case be remitted to the Opposition Division to consider novelty and inventive step.

The respondent (opponent) requested that the appeal be dismissed.

VII. The arguments of the appellant in support of its requests can be summarized as follows:

The skilled person knew that the term "apertured formed film" referred to films having through holes. For such films, the caliper was inevitably equivalent to the depth of the apertures. Accordingly, the disclosure in the application as filed of the depth of the apertures being at least 0.75 mm was equivalent to the disclosure of the caliper of the film being at least 0.75 mm. Moreover, in the context of the patent in suit it was clear that the term "caliper of the apertured formed film" could only mean the height of the film, defined by the distance between parallel planes passing through the remotest points at either surface of the film, and not the thickness of the material constituting the film. Indeed, a film having a thickness greater than 0.75 mm would be too rigid for being used in a disposable absorbent intended to be worn by a wearer.

VIII. The respondent essentially argued as follows:

Since, as shown in particular by D3, various interpretations of the term "caliper of an apertured formed film" were possible, and the application as filed did not specify which meaning applied, there was no basis in the application as filed to conclude that the depth of the apertures was equivalent to the caliper of the apertured formed film. Furthermore, in the application as filed it was stated, on the one hand, that the apertured film "should meet the caliper requirements described above" and, on the other hand, that the "apertures of the formed film should meet the size and depth requirements set forth for the discrete regions". Therefore, the skilled person reading the application as filed would assume that the caliper and the depth of the apertures were two different parameters.