T 0691/94 () of 13.5.1996

European Case Law Identifier: ECLI:EP:BA:1996:T069194.19960513
Date of decision: 13 May 1996
Case number: T 0691/94
Application number: 89310266.5
IPC class: H03K 19/0175
Language of proceedings: EN
Distribution: C
Download and more information:
Decision text in EN (PDF, 157 KB)
Documentation of the appeal procedure can be found in the Register
Bibliographic information is available in: EN
Versions: Unpublished
Title of application: TTL-ECL level converting circuit
Applicant name: NEC CORPORATION
Opponent name: -
Board: 3.5.02
Headnote: -
Relevant legal provisions:
European Patent Convention 1973 Art 54(2)
European Patent Convention 1973 Art 56
Keywords: Inventive step (no)
Novelty - availability (no)


Cited decisions:
T 0248/85
T 0654/92
Citing decisions:
T 0730/05
T 1554/05
T 0211/06
T 0628/07
T 0413/08

Summary of Facts and Submissions

I. The appellant contests the decision of the examining division refusing European patent application No. 89 310 266.5. The reason given for the refusal was that the subject-matter of claim 1 did not involve an inventive step, having regard to matter designated in the application as "prior art" and common general knowledge in the art. As evidence of the latter the following documents were referred to in the decision under appeal:

D1: M. HERPY "Analoge Integrierte Schaltungen" 1979, Franzis Verlag, München, page 251;

D2: E. KÜHN "Handbuch TTL- und CMOS-Schaltkreise" 1985, VEB Verlag Technik, Berlin, pages 317 and 320.

II. The appellant argued essentially as follows:

It had not been established that the circuit of figure 1 of the present application was in fact prior art within the meaning of Article 54 EPC. The appellant wished to amend the description and figure heading to indicate that the circuit was neither "conventional" nor "prior art", but merely "proposed". On that basis the refusal would be entirely inappropriate.

The appellant also presented detailed arguments as to why the claimed circuit was inventive over the circuit of figure 1.

III. The appellant requested that the decision under appeal be set aside and a patent granted on the basis of the application as refused, subject to amendment of the description and drawings to indicate the status of the figure 1 circuit as "proposed", rather than "prior art".

Reasons for the Decision

1. The appeal is admissible.

2. State of the art

2.1. The issue in this appeal is inventive step. As always, a critical preliminary step in addressing this question is the determination of the relevant "state of the art", with a view to identifying a closest prior art. Following decisions T 248/85, OJ EPO 1986, 261 (points 9.1 and 9.2) and T 654/92 of 3 May 1994 (points 4.2 and 4.3), the board rules that the matter illustrated by and described in connection with figure 1 of the present application is not comprised in the state of the art for the purposes of Article 56 EPC since there is no evidence before the board that this art was made available to the public as required by Article 54(2) EPC.

2.2. In its reasoning in the decision under appeal the examining division relied on the applicant's own acknowledgement as such evidence. Since, however, the applicant has now, in the statement of grounds of appeal, resiled from this acknowledgement, and since this internal prior art was the only "state of the art" considered in the impugned decision - apart from ancillary evidence of common general knowledge in the art - the first instance finding of lack of inventive step has been deprived of its essential basis. In effect the examination required by Article 94(1) EPC has not yet taken place as far as an objective assessment of novelty and inventive step is concerned. In these circumstances, in order to avoid loss of an instance, the case has to be remitted to the department of first instance for examination on the basis of the relevant state of the art within the meaning of Article 54 EPC.


For these reasons it is decided that:

1. The decision under appeal is set aside.

2. The case is remitted to the department of first instance for further prosecution.

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