T 0306/93 (Nail enamel/REVLON) 30-07-1996

I. European patent No. 0 136 704 was granted on the basis of 16 claims contained in European patent application No. 84 111 810.2. Claim 1 as granted reads as follows:

"1. A nail enamel comprising

(a) an inorganic pigment selected from iron oxides, titanated mica, iron oxide coated mica, titanium dioxide, ultramarine, chromium oxide, chromium hydroxide, and manganese violet, wherein said inorganic pigment is precoated with a polyorganosiloxane, including polymeric chains having up to 100 or even 1,000 repeating (Si-O) units, wherein the chains are cross-linked to each other, the remaining function sites of each Si-atom in the chain are occupied by hydrogen methyl, C2-C30 alkyl or alkenyl, and/or phenyl, resulting in units such as

(Si(CH3)(C6H5)O), (Si(CH3)(H)O), or (Si(H)(C6H5)O),

and generally capped with

-Si(CH3)3,

wherein said precoating is provided by reacting the uncoated pigment with a silicone material selected from

(A) a silane of the formula A1SiX1X2X3, wherein A1 is alkyl or alkenyl having up to 30 carbons atoms and X1, X2 and X3 are independently chloro, methoxy or ethoxy,

(B) (CH3)3SiO(Si(CH3)2O)nSi(CH3)2OA2 wherein n is 1 to 100 or up to 1,000, and A2 is C1-C30 alkyl, or

(C) (CH3)3SiO(Si(CH3)(H)O)p Si(CH3)3, wherein p is 1 to 100 or up to 1 000,

so that at least one Si-atom of each chain is linked to the pigment surface or the coated pigment surface through an oxygen atom, wherein the precoated pigment comprises up to 10 wt.% of the nail enamel and

(b) a base comprising nitrocellulose, solvent and a suspending agent and optionally also including a resin and a plasticizer.

II. Opposition was filed under Article 100(a) EPC against the granted patent by the Appellant. Of the documents cited during the opposition, the following remains relevant to the present decision

(1) WHITTAKER,CLARK & DANIELS, INC. "PRODUCT DATA" CLARK COLORS, INC., PURIFIED INORGANIC COLOR, "COSMETIC HYDROPHOBIC RED OXIDE # 9454 CS#11540", "3/78", (publication date March 1983, cf. Declaration by Nathaniel Goodwin, dated 16 January 1992, received 25 January 1992).

III. The Opposition Division rejected the opposition.

The decision was not based on the results of the comparative tests, filed by the Patentee (Respondent) with letter dated 5 October 1992. It was pointed out that the Opponent (Appellant) failed to show that the products "CS11760" and "CS11595" according to the said tests had been made available to the public before the priority date of the patent in suit.

The Opposition Division took the view that the Opponent did not file any evidence that the so-called Whittaker, Clark & Daniels (WCD)-pigments according to document (1) comprised the specific polysiloxane coating with a covalent bonding of oxygen to the pigment surface as set out in the patent in suit. The reference to product numbers of (WCD)-pigments according to the patent in suit did not necessarily mean that the corresponding products could be used without a further coating treatment. Moreover, document (1) did not relate to a nail enamel composition as such but only disclosed the possible use of a pigment in a nail lacquer. Consequently, the subject matter of claim 1 as granted was novel.

In the light of the closest prior art according to document (1) the problem underlying the patent in suit was the "prevention of migration and settling of the pigments". Since the "superior performance" of the compositions according to the worked examples of the patent in suit in comparison with untreated pigments was non-obvious in the light of the relevant prior art, the claimed subject matter involved an inventive step.

IV. The Appellant lodged an appeal against this decision. Oral proceedings took place on 30 July 1996. The arguments of the Appellant, both in the written procedure and at the oral proceedings, may be summarised as follows.

The Appellant argued that the Respondent presented a "totally unnatural" interpretation of the wording of the patent in suit. It had not been shown that the reference to the product number 9454 in document (1) and that in the patent in suit related to different types of hydrophobic coated iron oxide pigments. The description of the patent in suit clearly indicated that suitable coated pigments could be obtained from the known distributor Whittaker, Clark & Daniels, Inc according to document (1) and that alternatively one could prepare the coated pigment by appropriate reaction steps, which meant nothing more than that instead of using commercially available products the person skilled in the art was in a position of producing suitable coated pigments. It was common practice of chemical suppliers not to indicate on data sheets such as document (1) such data as the preparation method, or the starting material . However, it was not difficult for a person skilled in the art to determine the technical background why product 9454 showed hydrophobic properties. Consequently, it could be assumed that the specific coating on the said pigment 9454, forming basis for the alleged invention, was carried out before selling the product to the Respondent and there was no doubt that this product was available to the public before the priority date of the patent in suit. If on the other hand the Respondent insisted on the fact that the product 9454 used according to the examples of the patent in suit was not the same as the product 9454 according to document (1), a new ground of opposition under Article 100(b) must be raised. Neither the preparation nor the structure of the coated pigments used in the examples of the patent in suit had been defined.

Taking into account that document (1) did not expressly describe a base of the nail lacquer, novelty of the claimed subject matter could be accepted. However, document (1) expressly made reference to the use of the product 9454 in nail lacquers and therefore, it was nothing more than routine for a person skilled in the art to formulate the product 9454 with a conventional base and thus obtain in an non-inventive manner the claimed nail enamels. Since the claimed nail enamel was obvious per se, the reduction of settling and migration of the pigment in the corresponding formulation could only be regarded as an unexpected "bonus" effect in accordance with the decision T 21/81.

Moreover, it was to be noted that the comparative tests filed by the Respondent did not comprise any proof with respect to the presence of covalent bonds between the polyorganosiloxane coating and the surface of the pigment and did not show that said covalent bond was the only factor exerting an influence on the settling and migration results. In the same way, the reference to test results from anonymous products only characterised by non-identifiable code numbers without any further technical information was not suitable to demonstrate the presence of a selection invention. In the absence of a defined objective [group of test objects] a selection was impossible in any case.

The Opposition Division's conclusion that it was the Appellant's responsibility to provide technical information about the products given a name but unidentified as to their compositions constituted a substantial procedural violation.

V. The Respondent took the view that Document (1) suggested neither a coating of the pigments nor the special properties that the coating had to possess in order to cause the intended effects of reducing settling and migration when introducing the pigments into the nail enamel. More particularly, it was to be noted that the product described in document (1) initially did not have the properties as claimed in the patent in suit, but only after appropriate treatment. Comparative tests showed that "when using the hydrophobic pigments supplied by WC&D" under only one product number according to the invention, only the pigments on the surface of which the silicone was bonded covalently fulfilled the purpose according to the invention". The characterization "hydrophobic pigments" according to document (1) meant nothing more than pigments coated with anything which became hydrophobic by coating. Furthermore, the reference to a product number according to document (1) did not allow the conclusion to be drawn that the product was marketed under the same number over several years without any modification of its composition or physical properties. Only the description of the patent in suit clearly related to the mechanisms and procedures essential to produce the coating of the pigment surface and provided the teaching how to test the commercially available pigments with respect to their applicability in a nail enamel.

It was accepted that the reference to a coated pigment surface in claim 1 on page 5, line 19 of the patent in suit raised the question of interpretation and that the explanations on page 3, lines 44/45 relating to the treated pigments used according to the worked examples of the patent in suit did not expressly indicate that it was necessary to carry out a further coating procedure on commercially available pigments which already comprised a coating. However, taking into account the teaching of the patent in suit as a whole, it was clear that only pigments with the product number 9454 from Clark Colors, treated according to the coating procedure set out in claim 1 of the patent in suit, showed the good results of Table 1 and Table 2 of the worked examples. Confirmation was given by the comments on page 4, lines 59 to 61 relating to the results of the worked examples. It was particularly pointed out that an improvement over the pigments disclosed in document (1) could be derived from the results according to Example 3 in Table 2 on page 4.

The reference to "satisfactory colors" on page 2, line 61 of the description of the patent in suit clearly did not relate to satisfactory results attainable by the inclusion of pigments in a nail enamel but related to the satisfactory colour effect of the pigment particles. There was no doubt for a person skilled in the art that satisfactory results within the meaning of the invention could only be achieved by the characteristics according to claim 1 of the patent in suit. In this respect the patent in suit comprised the teaching to hydrolyse the polysiloxane coating material according to claim 1. Such a hydrolysation step would result in the formation of covalent bonds to the pigment surface through oxygen atoms. Moreover, there was an advantage in view of the fact that the polymeric chains of a secondary coating layer were cross-linked to the coated surface.

Article 84 EPC did not represent a ground of opposition and it was in any case allowable to give some interpretation to the wording of the description of the patent in suit. Accordingly, the patent in suit also fulfilled clearly the requirements of Article 83 EPC.

The Respondent did not consent to lack of disclosure under Article 83 EPC being considered.

As regards the Appellant's doubts whether or not covalent bonds were formed according to the coating procedure of the patent in suit and the alleged lack of technical information about the group of tested pigments, it was the Appellant's task to prove the incompleteness or falsity of the doubted comparative tests.

VI. The Appellant requested that the decision under appeal be set aside and that the patent be revoked. He requested also reimbursement of the appeal fee and an apportionment of costs against the Respondent.

The Respondent requested that the appeal be dismissed and that the patent be maintained on the basis of claim 1 according to amended page 4 of the patent in suit, lines 64 and 65, filed with letter dated 28 June 1996 and amended page 5 of the patent in suit, lines 1 to 22, filed with letter dated 1 July 1996; claims 2 to 6. on page 5, of the patent in suit, filed with letter dated 1 July 1996 and claim 8 according to the separate sheet attached to the letter dated 28 June 1996, claim 7 being deleted.