T 1784/08 () of 29.6.2009

European Case Law Identifier: ECLI:EP:BA:2009:T178408.20090629
Date of decision: 29 June 2009
Case number: T 1784/08
Application number: 04741868.6
IPC class: H01M 4/86
Language of proceedings: EN
Distribution: D
Download and more information:
Decision text in EN (PDF, 27 KB)
Documentation of the appeal procedure can be found in the Register
Bibliographic information is available in: EN
Versions: Unpublished
Title of application: Electrochemical Thermodynamo
Applicant name: Hysytech S.r.l., et al
Opponent name: -
Board: 3.4.03
Headnote: -
Relevant legal provisions:
European Patent Convention Art 123(2)
Keywords: -


Cited decisions:
Citing decisions:

Summary of Facts and Submissions

I. This is an appeal from the refusal of application 04 741 868 for the reason that dependent claims 2 and 12 had been amended in such a way that they contained subject-matter extending beyond the content of the application as filed (Article 123(2) EPC).

II. The appellant applicant requests that the decision under appeal be set aside and that a patent be granted on the basis of the following documents:

Description: pages 1 to 3 and 4 to 11 filed with letter of 6 August 2008;

page 3a filed with letter of 16 June 2009;

Claims: 1 to 13 filed with letter of 16 June 2009;

Figures: 1/2 to 2/2 as originally filed.

III. The examining division argued as follows:

- Claims 2 and 12 stated that "means are provided to supply heat from an external heat source" and that "heat is supplied from an external heat source", respectively. An external heat source, however, had only been disclosed in the originally filed application in connection with a electrochemical cell for water electrolysis, this being an endothermic process. As the independent claims 1 and 11 were not limited to water electrolysis, but also included the use of the electrochemical cell as a fuel cell, en exothermic process, claims 2 and 12 contained subject-matter not disclosed in the original application documents.

- Moreover, dependent claims 9 and 10 which inter alia referred back to claim 2 gave rise to the combination of external heat supplying means with a fuel cell using O2 and H2 as feed gases, an exothermic process. Such a combination of features was not disclosed in or derivable from the originally filed application.

IV. In reply to a communication of the board under Rule 100(2) EPC in which objections under Article 84 EPC 1973 and 123(2) EPC were raised, the appellant deleted claims 2 and 12 and amended previous claims 7, 9 and 15 (now renumbered as claims 6, 8 and 13).

Reasons for the Decision

1. The appeal is admissible.

2. Amendments

2.1 Claim 1 is directed to electrochemical cell modules. These modules can be used either for electrolysers in which H2O is dissociated into H2 and O2 gases under application of an electric current, an endothermic process, or as fuel cells in which H2 and O2 gases are combined to form H2O to generate an electric current, an exothermic process (page 3, lines 17 to 18; page 4, line 19 to page 5, line 3).

2.2 Dependent claims 2 and 12 objected to by the examining division as not fulfilling the requirements of Article 123(2) EPC 1973 were deleted in response to the communication of the board maintaining this objection and claims 6 and 9 were amended so as to no longer specify heat or cold supplying means.

As the use of heat supplying means in an electrochemical exothermic process or cold supplying means in an electrochemical endothermic process is no longer claimed in the present claims, the requirements of Article 123(2) EPC 1973 in this respect are now fulfilled.

2.3 Claim 12 has been amended to specify that external heat is supplied to an electrolytic process in which H2 and O2 are formed (an endothermic process). This was originally disclosed on page 7, lines 8 to 10 and page 11, lines 3 to 7.

2.4 The description has been adapted to the claims (page 3a).

2.5 The board judges, for the above reasons, that the application fulfils the requirements of Article 123(2) EPC.

3. Independent claim 10 is directed to an electrochemical process utilizing the electrochemical cells of claims 1 to 10. However, there are now only nine claims to an electrochemical cell and claim 10 should be amended accordingly.

4. As the examination of the further requirements of the EPC has not yet been carried out, remittal of the case for further prosecution pursuant to Article 111(1) EPC is appropriate.


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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