T 0888/02 12-08-2004

I. The appellant (patent proprietor) lodged an appeal against the decision of the Opposition Division revoking the European patent No. 0 825 927 (hereinafter patent in suit).

II. Oppositions were filed against the patent as a whole and based on Article 100(a) EPC (lack of novelty, Article 54 EPC, and lack of inventive step, Article 56 EPC), 100(b) and 100(c) EPC.

III. The date of filing of the patent in suit is 22 April 1997. The priority documents referred to in the patent in suit are the following:

P1: GB 9608394, 23 April 1996;

P2: GB 9614693, 12 July 1996;

P3: WO PCT/GB96/01973, 13 August 1996;

P4: GB 9700884, 17 January 1997.

IV. The Opposition Division held that none of the priorities claimed in the patent in suit were valid and that the ground for opposition cited in the Article 100(a) EPC (lack of novelty, Article 54 EPC) prejudiced the maintenance of the patent having inter alia regard to document

DA4: EP-A 0 823 327.

V. With the statement setting out the grounds of appeal filed on 10 October 2002, cf. page 1, the appellant declared that he wished to proceed in this appeal with the enclosed Main Request (corresponding to Auxiliary Request 1 in the opposition proceedings, which was the only request maintained before the Opposition Division). The appellant maintained his position that the priorities of the patent in suit were valid and that, therefore, document DA4 did not form part of the state of the art and was not to be considered when assessing novelty.

After having received the submissions of respondents I, II, III (opponents 01, 02, 03), all objecting the validity of the priorities claimed in the patent in suit and alleging lack of novelty with regard to document DA4 and other documents, the appellant declared with letter filed on 20 August 2003 that he intended to study each of the replies of the respondents with a view to filing a consolidated response. A consolidated response has not been received however.

On 11 May 2004, the Board dispatched summons to attend oral proceedings on 12 August 2004. In the communication accompanying the summons, the Board made mention that none of the priorities of the patent in suit seemed to be valid and that the subject-matter of claim 1 according to the single request of the appellant appeared not to be novel with regard to document DA4, as pointed out in the decision under appeal. The Board further noted that any written submission should be filed well in advance, i.e. at least one month before the date of oral proceedings.

On 12 July 2004, the appellant filed a new main request (with claim 1 not amended with respect to claim 1 of the former main request) and 29 auxiliary requests. On page 1 of the accompanying letter, he declared that "If the Board does not accept the proprietor's Main Request, we will ask that they consider an Auxiliary Request. If the Board does not accept the nominated Auxiliary Request, we request that they consider another Auxiliary Request. It is proposed to nominate the Auxiliary Requests during the Oral Proceedings having regard to the findings of the Board."

An annex was enclosed summarily indicating a basis in the application as filed in respect of amendments which, for the first time, appeared in a request.

On page 2, seventh paragraph, of the letter accompanying the auxiliary requests, the appellant further declared: "We are not now filing further argumentation as regards the substantive issues. Those issues have already been very well aired by the parties and we do not see much further purpose in providing more argumentation at this stage. We feel that it is better to do so at the Oral Proceedings once we have a better view of how the Board views the respective matters."

In a communication dated 19 July 2004, the Board informed the parties that it may consider not admitting the auxiliary requests 1 to 29. The Board further stated that it appeared that the auxiliary requests filed at the latest moment provided for in the summons were not sufficiently substantiated and may therefore be disregarded under Article 114(2) EPC.

On 23 July 2004, the appellant filed further comments concerning the subject-matter of claim 1 of the auxiliary requests and the objection of lack of novelty with regard to inter alia document DA4.

VI. Oral proceedings were held before the Board of Appeal on 12. August 2004. Respondent I, having previously informed the Board that he would not attend the oral proceedings, was not present.

VII. The appellant requested that the decision under appeal be set aside and the patent be maintained on the basis of the following documents filed on 12 July 2004:

(i) Claims 1 to 20 filed as main request; or

(ii) the sets of claims according to auxiliary requests 1 to 29

VIII. Respondents I, II and III requested that the appeal be dismissed.

IX. Claim 1 according to the main request reads as follows:

"1. A positive working lithographic printing form precursor having a coating comprising an oleophilic, heat-sensitive composition on a support having a hydrophilic surface, the composition comprising an aqueous alkaline developer soluble polymeric substance, and a compound which reduces the aqueous alkaline developer solubility of the polymeric substance, wherein the aqueous alkaline developer solubility of the composition is increased on heating and the aqueous alkaline developer solubility of the composition is not increased by incident UV radiation."

X. In the written procedure and during oral proceedings, the appellant argued essentially as follows:

Added subject-matter

The subject-matter of claim 1 of the main request was disclosed in the application as filed. In particular, the feature of the composition comprising an aqueous alkaline developer soluble polymeric substance was disclosed in the application as filed (printed version) on page 11, lines 9 to 13. In that passage a plurality of developers were cited, and, among them, also alkaline components. The restriction of claim 1 of the main request to an aqueous alkaline developer soluble polymeric substance thus focussed the invention on a disclosed feature. Consequently, claim 1 of the main request met the requirements of Article 123(2) EPC.

Priority

The subject-matter of claim 1 of the main request was derivable from the content of priority document P2, taking into consideration the general knowledge of a person skilled in the art. The introductory part of document P2 first directed the reader to the widely known UV-sensitive lithographic printing plates. In the following, it was pointed out that, in contrast to the prior art, the invention concerned heat mode imaging wherein a heated stylus as well as a laser having a wavelength above 600 nm might be used. It was thus clear to the person skilled in the art that the lithographic printing plate referred to in document P2 was heat sensitive rather than UV-sensitive. Actually, the compositions described in all examples of document P2 were insensitive to incident UV-radiation.

Novelty

The subject-matter of claim 1 of the main request was novel with regard to the disclosure of document DA4. In particular, document DA4 did not disclose the feature of the aqueous alkaline developer solubility of the composition not being increased by incident UV- radiation. Document DA4, cf. page 2, lines 54 to 56, and page 4, lines 9 to 12, did not disclose insensitivity to UV-light in the sense that the solubility was not increased. Moreover, white light was different from UV-light and the passage on page 4, lines 9 to 12, of document DA4 only referred to weak UV- light.

Furthermore, according to page 23, lines 22 to 24, of document DA4, the composition might be sensitive to UV- light, and, according to the examples described in document DA4, imaging of the printing plates was carried out under a yellow lamp. Moreover, the examples mentioned under the heading "Safe light property" on page 36, lines 13ff, of document DA4 were not disclosed in any of the priority documents of document DA4, so that document DA4 was not entitled to the claimed priority dates in this respect.

Admissibility of auxiliary requests 1 to 29

Auxiliary requests 1 to 29, which were filed in due time on 12 July 2004, should be admitted into the proceedings. A patent proprietor should have the right to defend its patent.

The appellant had been hindered from filing auxiliary positions at an earlier stage of the appeal proceedings because doing so would have borne the risk of prejudicing the course of German patent litigation and Japanese opposition proceedings. Only recently, the litigation proceedings had been settled, and the opposition proceedings had come to an end.

At the outset, the appellant had believed in the validity and allowability of the main request. The provisional opinion of the Board of Appeal accompanying the summons, however, changed the way the claims had to be understood. The appellant had managed to file auxiliary requests within the time limit set by the Board of Appeal, although the time for filing amendments had been very short and the case was very complex.

Filing a large number of auxiliary requests could not possibly give rise to an abuse of process. Furthermore, the requests were well structured, and, from the table representing an overview filed with letter of 23 July 2004, it could be seen that, actually, only the subject- matter of six amended claims had to be considered. Furthermore, the appellant had assisted the other parties by indicating the passages in the application as filed forming a basis for the subject-matter of the amended claims according to auxiliary requests 1 to 29. On 23 July 2004, the appellant had further submitted arguments with regard to the issue of novelty in respect of document DA4 and other documents.

Before the Board could take a decision on admitting auxiliary requests 1 to 29 or not, the appellant should be given the opportunity to present his arguments as to why these requests might be allowable. There was no basis in the European Patent Convention for any need of substantiating a request.

XI. In the written procedure and during oral proceedings, respondents I, II and III argued essentially as follows:

Added subject-matter

According to the application as filed, cf. in particular claims 4 and 5, the feature of the developer being alkaline was coupled to the feature of the polymer being a phenolic resin. The specific examples 12 to 18 indicated on pages 24 and 25 of the application as filed (printed version) were no basis for a generic disclosure of a composition comprising an aqueous alkaline developer soluble polymer wherein the polymer was not necessarily a phenolic polymeric substance. On page 11, line 9, of the application as filed (printed version), it was indicated that the aqueous developer composition was dependent on the nature of the polymeric substance, and the passage on page 11, lines 14 and 15 of the application as filed (printed version) showed the relationship of alkaline developers to phenolic resins. The list of developers on page 11, lines 10 to 13 of the application as filed (printed version), referred to the common general knowledge and did not define the invention. The subject- matter of claim 1 of the main request thus extended beyond the content of the application as filed. The requirements of Article 123(2) EPC were therefore not met.

Priority

Priority document P2 disclosed neither implicitly nor explicitly the feature of claim 1 of the main request that "...the aqueous alkaline developer solubility of the composition is not increased by incident UV radiation". At the priority date of the patent in suit, compositions had been known which were UV-sensitive and heat sensitive. There was no indication in priority document P2 that UV-sensitivity should be excluded. Although the materials mentioned in priority document P2 might be insensitive to UV-light, the presence of such an intrinsic or extrinsic property could not be regarded as a basis for an implicit disclosure of the above-mentioned feature of claim 1 of the main request.

The patent in suit was not entitled to the priorities of priority documents P1 and P4 for substantially the same reasons. Priority document P3 was not a first application within the meaning of Article 87(1) EPC.

Novelty

Since none of the priorities referred to in the patent in suit was valid, document DA4, which correctly claimed the priority of 6 August 1996, represented prior art according to Article 54(3) EPC.

Document DA4 disclosed a positive working lithographic printing precursor comprising an oleophilic, heat- sensitive composition having all the features of claim 1 of the main request as pointed out in the decision under appeal. In particular, as a preferred embodiment, document DA4 literally disclosed that the composition was not substantially sensitive to UV-light (cf. page 4, lines 9 to 12, and page 23, lines 25 to 27) which meant nothing else than that the aqueous alkaline developer solubility of the composition was not increased.

Admissibility of auxiliary requests 1 to 29

The filing of auxiliary requests 1 to 29 encompassing 110 pages had been delayed by the appellant solely for tactical reasons in view of other pending proceedings.

The appellant could not have been surprised by the provisional opinion of the Board of Appeal. It did not contradict, but rather confirmed the decision reached by the Opposition Division.

The filing of auxiliary requests 1 to 29 only one month before the oral proceedings gave rise to a new complex situation. The 29 sets of claims, mostly defining new combinations of features that had never been discussed before, were not easily understandable. No statement whatsoever had been provided as regards the validity of the priority claims, or as regards novelty and inventive step, for any of auxiliary requests 1 to 29.

The filing of auxiliary requests 1 to 29 without any additional explanatory arguments as to their allowability rendered them already unacceptable; they had therefore to be rejected under Article 114(2) EPC.