T 0016/95 29-09-1998

Summary of Facts and Submissions

I. The appellant (opponent) lodged an appeal received on 24. December 1994 against the decision of the Opposition Division to reject the opposition and to maintain the patent No. 323 421 as granted.

The statement setting out the grounds of appeal was received on 23 February 1995. The fee for appeal was paid on 24 December 1994.

II. Originally one opposition has been filed on the sole ground of lack of inventive step having regard to seven documents.

This opposition has been rejected by the decision of the Opposition Division dated 2 November 1994.

In its original grounds of appeal, filed on 23 February 1995, the appellant still maintained its allegation of lack of inventive step, now exclusively based on the documents D4 and D5 already cited during the opposition proceedings.

On 18 May 1995, by letter of 17 May 1995, the appellant, for the first time, alleged lack of novelty (Article 54(3),(4) EPC) having regard to document D8 = EP-A-0 313 222.

By letter of 24 June 1996 the respondent (proprietor) has given its consent to the admittance of D8, but denied that the subject-matter of claim 1 as granted lacked novelty having regard to the disclosure of this document.

III. On 2 December 1997, a third party intervened in the opposition proceedings under Article 105 EPC on the basis of the infringement proceedings instituted against it on 4 September 1997.

The intervention was mainly based on lack of novelty on the basis of Article 54(3)(4) EPC having regard to document I3 = EP-A-320 024 having a priority date of 12. June 1987 and a publication date of 14 June 1989, (see point 1.1 of the letter of intervention) having regard to two oral disclosures in May 1988 and August 1988, respectively, which were allegedly performed by two employees of the proprietor (see points 1.2.1 and 1.2.2. of the letter of intervention) and having regard to document D8. There were also two events of prior use alleged to have taken place in spring and in early summer 1987 (state of the art according to Article 54(1)(2) EPC).

It was further asserted that the oral disclosures based on document I3 even constitute a state of the art according to Article 54(1)(2) EPC, because the priority of the patent in suit had not been validly claimed, the priority document not being the first disclosure of the subject-matter claimed by the patent in suit.

IV. By letter of 28 January 1998, the respondent (proprietor) filed a new claim 1 to be followed by claims 2 to 6 as granted requesting that the patent be maintained as amended on the basis of this set of claims.

Claim 1 reads as follows:

"An angulated spacer for a dental implant adapted at its one end for attachment to a fixture (19) implanted in the jaw bone and at its other end adapted to support a dental prosthesis characterised in that said spacer is made as a unitary member comprising a base portion (1) being lockable in a fixed rotational position with respect to the fixture by means of a first screw union (6) and an upper portion (9) having a second screw union for securing the dental prosthesis, said second screw union forming a fixed angle ( ) with respect to the first screw union (6), and in that said base portion (1) has an interior geometrical configuration (20) designed to fit an upper hexagon of the fixture (19) so as to constitute a rotational lock providing twelve fixed directions for the spacer."

The respondent asserted that the subject-matter of claim 1 was novel having regard to the disclosure of documents D8, I3 and that the subject-matter of the present restricted claim 1 was validly covered by the Swedish application, the priority of which is claimed by the patent in suit.

V. The appellant, by letter of 2 April 1998, cited two new documents D9 and D10.

The intervenor, by letter of 16 April 1998, objected that claim 1 violated Article 123(2) EPC, still denied novelty with respect to document D8 and maintained that the asserted prior use and said oral disclosures constituted a state of the art according to Article 54(1)(2) EPC. It requested also to remit the case to the first instance.

VI. On 1 July 1998 the Board issued a communication with which it stated that it was its intention to remit the case to the first instance for further prosecution without having oral proceedings.

The intervenor, with letter of 8 July 1998, gave its agreement.

The proprietor, with letter of 3 September 1998, accepted the proposal of the Board.

VII. The appellant requests that the decision under appeal be set aside and a patent revoked for lack of novelty or inventive step. Provisionally, he requests oral proceedings.

The intervenor requests that the decision under appeal be set aside and that patent revoked for lack of novelty or for lack of inventive step. It further requests to remit the case to the first instance.

The proprietor requests the rejection of the appeal and the maintenance of the patent in amended form with claim 1 as filed on 28 January 1998 and claims 2 to 6, description and drawing in the form as granted. He requests further provisionally oral proceedings.