T 0875/11 21-04-2016

Reasons for the Decision

Main request (patent as granted)

1. Article 100(c) EPC 1973

The ground for opposition under Article 100(c) EPC 1973 does not prejudice the maintenance of the patent according to the main request.

1.1 The deletion of the word 'about' from the expressions 'larger than about 0.015mm**(2)' and 'exceeding about 2000N/mm**(2)' does not extend the subject-matter of claim 1 beyond the content of the application as filed. As filed, the absolute values of 0.015mm**(2) and 2000N/mm**(2) were preceded by the word 'about' which extended their scope to also include values surrounding these absolute values. Thus, after deletion of the word 'about', only the absolute value is now claimed as a limit value, which value, in each case, was itself clearly disclosed to a skilled person when considering the previous broader expressions of about 0.015mm**(2)and about 2000N/mm**(2).

1.2 The amendment of the expression 'set of hoisting ropes comprising hoisting ropes of substantially circular cross-section' to 'set of hoisting ropes consisting of hoisting ropes of substantially circular cross-section' is also not found to extend the subject-matter of claim 1 beyond the application as filed.

Firstly in this respect, for the purpose of legal certainty when drafting patent claims, the word 'comprise' is interpreted to mean 'include' or 'contain' i.e. to not be limited just to those explicitly listed features. In contrast 'consists of' is interpreted to exclude the presence of elements in addition to those listed. As a consequence the amendment from 'comprising' to 'consists of' amounts to a restriction of the scope of the claim i.e. the set of hoisting ropes is limited to solely hoisting ropes of substantially circular cross-section.

Secondly, and specifically relating to the present case, there is no disclosure or suggestion in the application as filed that anything but ropes of circular cross-section make up the set of hoisting ropes. Wherever hoisting ropes are discussed in the application as filed, they are disclosed such that the hoisting ropes alone effectively make up any notional 'set' of ropes (see page 10, lines 1, 8 and 9, 13, 28 to 30; page 12, lines 11, 23; page 20, lines 7, 24, 33) with no reason to infer that anything other than circular cross-section ropes are included in such a set of ropes, this being so not least in view of page 18, lines 29 and 30 relating to the steel wire ropes 'of the invention' having substantially round cross-section. Thus, taken together, these sections of the description leave the skilled person in no doubt that the set of hoisting ropes may indeed 'consist of' hoisting ropes of substantially circular cross-section.

1.3 As regards opponent I's argument that the amendment was made to overcome a novelty objection, this is immaterial for the question of whether the amendment adds subject-matter. Furthermore, contrary to opponent I's opinion, the effect of the change can be understood, as indeed discussed in point 1.2 above, and this is found not to prejudice the maintenance of the patent under Article 100(c) EPC 1973.

2. Article 100(b) EPC 1973

The ground for opposition under Article 100(b) EPC 1973 does not prejudice the maintenance of the patent according to the main request.

2.1 There is no objection on file to that part of the invention relating solely to the features of the preamble of claim 1 under Article 100(b) EPC 1973, rather these are raised against the features of the characterising portion in the context of the invention defined in the preamble relating to an elevator, namely:

- the cross-sectional area of the steel wires of the hoisting ropes is larger than 0.015mm**(2) and smaller than about 0.2mm**(2), and that the steel wires of the hoisting ropes have a strength exceeding 2000N/mm**(2).

2.2 The Board has no doubt, and indeed the parties concurred, that at the priority date of the patent wires of the claimed cross-sectional area and lower limit strength of 2000 N/mm**(2) were commercially available. In view of this availability the respondents questioned, in the case that the disclosure were found to be sufficient, where the invention then lay. Whilst the Board appreciates the relationship alluded to between the objections under Article 100(b) EPC 1973 on the one side and inventive step on the other with respect to the claimed steel wires being commercially available, it is only objections under Article 100(b) EPC 1973 which are being addressed at this juncture, possible implications for inventive step being reserved for a decision on that ground for opposition.

2.3 As regards the objection raised by all the respondents, that the claimed wire strength was an open-ended range, for which at higher strength values the skilled person would not be able to carry out the invention, this is not accepted. The Board finds that possible embodiments falling under the literal wording of a claim, but which the skilled person would immediately exclude as being clearly outside the scope of practical application of the claimed subject-matter, do not present a hindrance to the invention being carried out (see also T1018/05, reasons 2.3). The skilled person would construe the claim as not extending to those 'theoretical' embodiments. Such is the case with claims including an open-ended range for a parameter where it is clear for a skilled person that the open-ended range is limited in practice, for example by currently available steel wire production techniques. Such a claim must be seen as seeking to embrace values of the parameter as high as can be attained above the specified minimum level. Values of the parameter not obtainable in practice therefore do not need to be considered and thus do not justify an objection of insufficiency of disclosure.

This applies to the present case concerning wire strength with an open-ended upper range. For the skilled person wishing to manufacture hoisting ropes using high strength wires, an understanding of the implications on the further hoisting rope design factors will be understood such that these can be selected accordingly (see also T487/89, Reasons 3.5). As discussed infra the skilled person merely has to construct a set of hoisting ropes for an 'elevator' using the given parameters. Factors such as the weight of the elevator car, its purpose (e.g. small light loads or large heavy loads), the operational longevity of the elevator, the particular design of the traction sheave (e.g. its dimensions) are all not specific features of the claim which the hoisting ropes made of the defined steel wires are required to fulfil, let alone simultaneously, even if many difficulties due to such factors might possibly arise with certain known and even technically reasonable commercial applications. As such, the open-ended range is in practice merely to be understood to be what the skilled person requires for constructing an elevator hoisting rope for an elevator within the broad possibilities specified in the claim.

2.4 As regards the respondents' objections that the appellant was claiming subject-matter including wire strengths which could not yet be made, this is not found to prevent the invention from being carried out in accordance with the claim. As already indicated in point 2.3 above, the skilled person would construe the claim as not extending to embodiments outside the scope of practical application of the claimed subject-matter. The as yet unobtainable wire strengths are thus understood by the skilled person to simply embody theoretical possibilities and that these do not lead to a justified objection of insufficiency of disclosure.

2.5 Regarding the objection of OIII that the invention lay solely in the high strength wires and that the upper limit should thus be defined in such a special case, the Board does not concur. If this argument were followed, the consequence would be that a patent applicant, in such cases, would have to establish where the absolute maximum wire strength lay, which would, the Board finds, be an unreasonable standard to expect in the present case. Also, in respect of the argument that 'the invention' lay solely in the open-ended wire strength and thus should be treated as a special case where an open-ended range should not be allowed, this is not the case. The invention is formed by the combination of features defined in claim 1, not merely the single feature of wire strength. Furthermore, in the present case, even the cross-sectional area of the wires is a limiting feature of the claim which provides a further limitation on the individual wires per se, even when ignoring the combination of such wires with further features of the claim such as the rope cross-section itself. Thus the Board cannot see that a special case is provided here where a departure from the aforegoing principles is justified.

2.6 The argument raised by OI and OII that a number of hoisting rope design features being omitted from claim 1 led to the disclosure being insufficient is not persuasive. It is accepted that issues such as wire fatigue strength against bending and torsion, abrasion resistance, corrosion resistance, design safety factors and rope coatings etc. are of fundamental importance in the design of a safe and commercially viable hoisting rope. However, the omission of these features from claim 1 does not present a hindrance to carrying out the invention as claimed, the hoisting rope of which simply has steel wires of a particular cross-sectional area and strength. As partly mentioned above, there is no requirement in claim 1 for the elevator to be of a particular load carrying capacity, of a specific physical size or to have a particular design life such that the above issues necessary for a commercially viable hoisting rope have no bearing on being able to carry out the invention according to claim 1.

2.7 In its decision, as also mentioned by the respondents, the opposition division argued (end of page 14) inter alia that an enabling disclosure was not present since the minimum requirements of sufficiency of disclosure of at least one embodiment being disclosed were not met and that this hindered the skilled person from carrying out the invention as claimed. Such an indispensable reliance on at least one embodiment of the invention is not justified. Of importance is whether the disclosure as a whole discloses a way of carrying out the claimed invention, allowing it to be carried out over its scope. In this respect it is perhaps of importance to mention that the requirement of Rule 42(1)(e) EPC is not necessary for fulfilling the requirement of sufficiency of disclosure. Whilst the rule states that 'the description shall describe in detail at least one way of carrying out the invention', the use of examples to do so is only required 'where appropriate'. The purpose of the 'examples' referred to in Rule 42(1)(e) EPC would be to complete a teaching which may otherwise be incomplete. In the present case there is nothing preventing the skilled person from using commercially available steel wires of the claimed cross-sectional area and strength in order to provide a hoisting rope as defined in claim 1. The skilled person is thus able to carry out the invention without reference to any specific embodiment or worked example defining possible rope classifications, constructions or rope types.

2.8 Further objections raised by the respondents concerning the hoisting rope diameter not being defined, the lay of the rope being undefined, the number of ropes in the set of hoisting ropes being unknown and the wire winding construction not being given, respectively also do not prejudice the sufficiency of disclosure of the invention defined in claim 1, to which objection has been made. Each of these factors may be seen as detailed design issues which the skilled person would resolve when designing an appropriate, commercially viable hoisting rope, which are however not required in order to carry out the invention as defined in claim 1. Indeed, as already identified in point 2.6 above, there is no requirement in claim 1 for the elevator to be of a particular load carrying capacity, of a specific physical size or to have a particular design life such that issues necessary for a commercially viable hoisting rope have no bearing on being able to carry out the invention according to claim 1.

2.9 The argument of respondent OII that the broad range of wire cross-sectional area claimed hindered the skilled person from carrying out the invention is not accepted. As correctly calculated by OII, the high end of the range is over 13 times the cross-sectional area of the low end, yet this per se does not present a hindrance to the skilled person carrying out the invention. This range simply presents the desired cross-sectional area of the claimed wires which have to be met in conjunction with the other parameters of the claim, such as the wire strength. The skilled person could clearly choose wires of the claimed strength and of cross-sectional areas within this range from the, as accepted by all parties, commercially available wires. OII further suggested that no importance of this particular cross-sectional area range was presented in the patent. This argument however might perhaps be relevant to inventive step considerations, but does not affect whether the skilled person can carry out the invention with such a range of wire cross-sectional areas.

2.10 The Board thus finds that none of the objections on file under Article 100(b) EPC 1973 prejudices the maintenance of the patent as granted.

3. Admittance of new attack

3.1 As regards the attack of OI that the skilled person was unable to reliably measure the cross-section of thin wires, this was a new (written) attack presented for the first time just a month prior to oral proceedings. The suggestion of OI that this attack could be inferred from page 6, 2nd paragraph of its response to the grounds of appeal, and was thus not a change of its case in terms of Article 13(1) of the Rules of Procedure the Boards of Appeal (RPBA), is not accepted. In this paragraph, whilst the cross-sectional area of the wires is identified, this was in relation to an argument that such a range was commonplace for wires in elevator ropes, rather than that the measurement of the cross-section could not be reliably carried out. As a consequence, since this attack had not been included in OI's arguments in its letter of response to the appellant's letter of grounds of appeal, it involves an amendment to its case which, according to Article 13(1) RPBA, may be admitted and considered at the Board's discretion. Of importance with respect to how such discretion is exercised is at least in part whether prima facie the new attack would be highly likely to change the Board's opinion on this ground of opposition.

3.2 The Board can see no hindrance to the skilled person reliably measuring the cross-sectional area of the wires in order to carry out the invention. Cross-sectional area is not an abnormal parameter and whilst a degree of variation between various measurement methods is to be expected, and such variation was also conceded by the appellant, no evidence has been presented proving that such differences would be significant enough for the skilled person to question whether the invention had been reached or not. Without substantiation of e.g. the magnitude of differences which might result from using the various measurement methods for calculating the wire cross-sectional area, and why such differences would e.g. cause an undue burden in carrying out the invention, there is no basis on which the Board can accept that the skilled person would be unable to carry out the invention.

3.3 The argument of OII in this respect was also not convincing. The reference to page 6 of its response to the grounds of appeal does indeed address the claimed range of wire cross-sectional area, although only with the conclusion that the range is not decisive for the invention. No conclusion can be drawn from this paragraph that the claimed range of cross-sectional area could not be reliably determined.

3.4 It thus follows that the attack whereby the cross-sectional area of the wires cannot be reliably determined, is not only a change of case but is, based on the evidence presented, prima facie not highly likely to prejudice maintenance of the patent under Article 100(b) EPC 1973. The Board thus exercised its discretion not to admit this line of argument characterising a change of case into the proceedings under Article 13(1) RPBA.

4. Remittal according to Article 111(1) EPC 1973

4.1 According to Article 111(1) EPC 1973, when deciding on an appeal, the Board may either exercise any power within the competence of the department which was responsible for the decision appealed or remit the case to that department for further prosecution.

In the present case, no decision was taken before the opposition division on the grounds for opposition under Article 100(a) EPC 1973. If the Board itself carried out the examination as to patentability, the parties would lose the opportunity of having an examination of the claimed subject-matter before two instances. With remittal having been requested both by the appellant and all the respondents, the Board avails itself of its power under Article 111(1) EPC 1973 to refer the case back to the department of first instance for further prosecution.