T 0412/02 16-06-2004

Reasons for the Decision

1. The appeal is admissible.

Procedural matters

2. As mentioned above in paragraph VI, the Respondent indicated with its letter dated 5 May 2004 that it would not be represented at the oral proceedings. In accordance with Rule 71(2)EPC, the proceedings continued without the Respondent.

Main request

3. Article 76(1) and 123(2) EPC

3.1. No objection under Article 76(1) and 123(2) EPC has been raised by the Respondent in its letter dated 10 January 2003 against the set of Claims 1 to 14 submitted by the Appellant with its letter dated 2 July 2002.

3.2. The Board is also satisfied that the requirements of Article 123(2) EPC are met by all the claims, since Claim 1 is supported by Claim 1 as originally filed, read in combination with the passage from page 18, line 44 to page 19, line 4 of the published application, and since Claims 2 to 14 are supported by Claims 2 to 14 as originally filed, respectively.

3.3. The same is further true for the requirements of Article 76(1)EPC, since Claim 1 finds its support in the published parent application EP-A2-0 534 119 in view of the combination of Claim 21 with Claim 29 read in association with the passage on page 16, lines 32 to 38 and the passage from page 18, line 51 to page 19, line 4 thereof. Claims 2 to 14 are supported by Claims 22 to 27 and 30 to 36, respectively, of the published parent application.

4. Article 123(3) EPC.

4.1. It is, in the Board's view, evident that the amendments in Claim 1 in respect to granted Claim 1, i.e. the limitation of the component (ii) to a polypropylene and the incorporation of the relation between melt tension and melt flow rate inevitably result in a restriction of the scope of protection in respect to granted Claim 1. One also comes to the same conclusion for Claims 2 to 14 which are directly or indirectly related to Claim 1.

4.2. Thus, the Board is satisfied that the requirements of Article 123(3) EPC are met by all the claims.

5. Article 84 EPC

5.1. As stated in decision T 301/87 (OJ EPO 1990,335) when amendments are made to a patent during an opposition, Article 102(3) EPC requires consideration as to whether the amendments introduce any contravention of any requirement of the Convention, including Article 84 EPC.

5.2. In the present case Claim 1 differs from granted Claim 1, in particular, in that it contains the features that, when the alpha-olefin/polyene copolymer (i) is an ethylene/polyene copolymer, the melt tension (MT) and the melt flow rate (MFR) of the alpha-olefin/polyene copolymer containing olefin polymer satisfy the following relation:

log[MT] >= -0.8 log[MFR] + 0.3;

and that, when the alpha-olefin/polyene copolymer (i) is a copolymer of alpha-olefin of 3 or more carbon atoms and polyene the melt tension (MT) and the melt flow rate (MFR) of the alpha-olefin/polyene copolymer containing olefin polymer satisfy the following relation:

log[MT] >= -0.8 log[MFR] + 0.30.

5.3. Thus, it follows, that these amendments are susceptible, as submitted by the Respondent in its letter dated 10 January 2003, to objections being raised under Article 84 EPC and that it must be checked whether these amendments made in granted Claim 1 comply with Article 84 EPC.

5.4. In this connection, the Appellant has submitted that the mathematical relation between the melt tension and the melt flow rate which has been incorporated in Claim 1 reflects structural properties of the claimed alpha-olefin/polyene copolymer containing olefin polymer, i.e. a specific block structure and a specific chain branching which, in its opinion, cannot be adequately defined in any other way. Furthermore, according to the Appellant, the incorporation of this feature aims to distinguish the claimed alpha- olefin/polyene copolymer containing olefin polymer from the cited prior art, in particular document E6A.

5.5. It can thus be deduced from the arguments submitted by the Appellant that this mathematical relation is the only characterizing feature of Claim 1 relied on for a distinction over the prior art, and that its role in indicating the limits of the claimed subject-matter, or, in other words, in defining the matter for which protection is sought, is a crucial one.

5.6. According to Article 84 EPC, the claims shall define the matter for which protection is sought (first sentence) and for this purpose they shall, inter alia, be clear and supported by the description (second sentence). This implies that the claims must be clear in themselves when being read with the normal skills, but not including any knowledge derived from the description of the patent application (cf. decision T 0988/02 of 30 October 2003, not published in OJ EPO; Reasons point 3.3.1).

5.7. As indicated above in paragraph 5.5, the characterizing feature of Claim 1 is the mathematical relation between the parameter MFR and the parameter MT. In the Board's view, the unambiguous characterization in a claim of a product by parameters or by a mathematical relation between parameters necessarily requires that each parameter can be clearly and reliably determined. It thus follows that the knowledge of the method and conditions of determination of the parameter is necessary for the unambiguous definition of the parameters and, by way of consequence, for the unambiguous definition of a mathematical relation between them.

5.8. Thus, in order to allow the matter for which protection is sought to be defined, it must be clear from the claim itself when being read by the person skilled in the art exactly how the parameters should be determined.

5.9. This would, as a rule, imply that the method of determination and the conditions of measurement which might have an influence on the value of the parameter should be indicated in the claim, either expressly or, if appropriate, by way of reference to the description according to Rule 29(6) EPC. Such indication would only become superfluous, provided it could be shown that the skilled person would know from the outset which method and conditions to employ because, for instance, this methodology was the methodology commonly used in the technical field, or that all the methodologies known in the relevant technical field for determining this parameter would yield the same result within the appropriate limit of measurement accuracy.

5.10. In the present case, Claim 1 contains no indication concerning the determination of the MFR parameter but the Appellant has submitted that the determination of this parameter is well known in the art. In that respect, it has pointed to the reference made in the patent specification to the standard ASTM D 1238 for the determination of the melt flow rate (cf. page 18, paragraph [0180] and to the reference to the same standard in document E1 (page 5, line 32 to page 6, line 2).

5.11. While it can be accepted, in the Board's view, that the standard ASTM D 1238 which relates to the measurement of the rate of extrusion of molten resins through a die of a specified length and diameter under prescribed conditions of temperature, load, and piston position as the timed measurement is being made, is a method commonly used in the art for the determination of the melt flow rate, it is however conspicuous to the Board that the ASTM D 1238 prescribes neither a unique temperature at which nor a unique load under which the test must be carried out. On the contrary, it clearly mentions a number of different standard test conditions (load, temperature) and it indisputably requires that the indication of the flow rate value be supplemented by the indication of the temperature and load selected for carrying out the particular test. It must therefore be concluded that the value of the melt flow rate is inevitably dependent on the temperature and the load at which the test is run, and that, therefore, the knowledge of the exact conditions of its determination (temperature, load) is essential to a clear and reliable determination of this parameter, and hence, to the unambiguous definition of the parameter. The Board further notices that, contrary to document E1 which clearly defines the conditions under which the melt flow rate of the polymers disclosed therein should be determined (i.e. 230°C, 2.16 kg; cf. page 6, lines 1 to 2), the patent in suit is totally silent on the temperature and the load which should be applied for the determination of the melt flow rate of the claimed polymers in the framework of the method disclosed in ASTM 1238.

5.12. Thus, the question of the unambiguous characterization of the claimed product by the use of the parameter MFR boils down to the question of whether the skilled person would inevitably know which measurement conditions (temperature and load) should be applied for determining the MFR of the claimed polymer in the framework of the standard ASTM D 1238.

5.13. In that respect, while the ASTM D 1238 might suggest that some conditions have been found satisfactory for known kinds of polymers such as polypropylene or polyethylene, it is immediately evident that the ASTM D 1238, even read in combination with the general technical knowledge of the skilled person, cannot give any indication on such satisfactory conditions for the alpha-olefin/polyene copolymer containing olefin polymers according to Claim 1, since, as submitted by the Appellant, they represent a new kind of polymer for which consequently no general technical knowledge is available.

5.14. This conclusion cannot be altered by the fact that component (ii) has been restricted to polypropylene. In the Board's view, this would not imply that the melt flow rate of the claimed polymer should be determined under conditions usual, if any, for polypropylene, since Claim 1 encompasses polymers which contain an overwhelming proportion (up to 99% by weight; cf. page 18, lines 37 to 38) of an alpha- olefin/polyene copolymer such as butene/1-9 decadiene, 1- eicosene/1,9 decadiene or 4-methyl-1-pentene/1-9 decadiene (cf. patent in suit, page 15, lines 28 to 29), and which cannot therefore be considered as exhibiting physical, structural or rheological similarities with polypropylene polymers.

5.15. Consequently, the Board can only come to the conclusion that there is a lack of information regarding the exact conditions, in particular the temperature and the load, under which the parameter melt flow rate is to be determined.

5.16. This lack of information results in uncertainty as to the definition of the parameter MFR and hence in uncertainty in the mathematical relation between the MFR and the MT set out in Claim 1.

5.17. This uncertainty is aggravated by further uncertainty in the definition of the melt tension (MT), for the following reasons:

5.17.1. Claim 1 contains no indication concerning the determination of the MT parameter but the Appellant has submitted that the determination of this parameter is well known in the art. It has further pointed to the paragraph [0192] of the patent specification which in its opinion gives a definition of the melt tension.

5.17.2. Independently of the fact that Claim 1 contains no reference to this passage of the description, it is noted by the Board that this paragraph which refers to using "a MT measuring machine (produced by Toyo Seiki Seisakusho K.K.)" gives no details which would specify the machine used precisely, especially as regards piston size, orifice size, and the force applied stress vs. mass.

5.17.3. Even if one would consider that the test machine and its dimensions would be known to the skilled person and that he would understand the units of the results to be expressed as mass force rather than as a simple mass in grams, as indicated in the examples (cf. Tables 1, 2 and 3), it is in any case evident that that the value of the melt tension is dependent on the temperature at which it is determined. This implies that the knowledge of the exact temperature at which the test should be carried out is essential to the clear and reliable determination of this parameter, and hence to its unambiguous definition.

5.17.4. Thus, the question of the unambiguous definition of the parameter MT also depends on whether the skilled person would know which temperature should be applied for the determination of the MT of the polymers according to Claim 1.

5.17.5. In this connection, it is evident that the skilled person cannot rely on common general knowledge on that issue, since, as submitted by the Appellant, the claimed polymers represent a new kind of polymer for which consequently no common general knowledge is available.

5.17.6. This lack of information in the claim concerning the exact temperature at which the MT of the claimed polymers should be determined cannot even be compensated by a reference in the claim to the description, since paragraph [0192] does not disclose the temperature at which this test should be carried out for the claimed polymers, since it merely mentions that the cylinder of the MT measuring machine should be kept at "a melting temperature" of the polymer without, however, defining it. This deficiency cannot further be repaired by the fact that this paragraph indicates the temperature at which this test should be carried for polypropylene (i.e. 230°C), firstly, since it is not clear whether the "melting temperature" referred to is the melting point, or some other temperature arbitrarily above the melting point, and secondly, since this cannot be understood as applicable to the polymers according to Claim 1 for the reasons set out in Section 5.14 above.

5.17.7. Thus, the Board can only come to the conclusion that there is a deficiency of information regarding the exact conditions, in particular the temperature, under which the parameter melt tension is to be determined.

5.18. Consequently, with uncertainty in both the relevant parameters MFR and MT for the reasons given above, it is not clear what limitation, if any, is implied by the mathematical relationship between them for the subject-matter of Claim 1.

5.19. In particular, it is evident that the mathematical relationship cannot limit the claim in any clear way to specific structures as submitted by the Appellant at the oral proceedings, or indeed represent any other clear limitation. In other words, the claim is not clear as required by Article 84 EPC.

5.20. Since Claim 1 does not comply with Article 84 EPC, the main request must be refused.