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T 1872/13 () of 19.6.2015

European Case Law Identifier: ECLI:EP:BA:2015:T187213.20150619
Date of decision: 19 June 2015
Case number: T 1872/13
Application number: 11164143.7
IPC class: H03M 13/05
H03M 13/11
Language of proceedings: EN
Distribution: D
Download and more information:
Decision text in EN (PDF, 241.642K)
Documentation of the appeal procedure can be found in the Register
Bibliographic information is available in: EN
Versions: Unpublished
Title of application: Structured LDPC design with vector row grouping
Applicant name: Motorola Mobility LLC
Opponent name: -
Board: 3.5.02
Headnote: -
Relevant legal provisions:
European Patent Convention Art 76(1)
Keywords: Divisional application - added subject-matter (yes)


Cited decisions:
Citing decisions:

Summary of Facts and Submissions

I. This is an appeal of the applicant against the decision of the examining division to refuse European patent application No. 11 164 143.7. This application is a divisional application of European patent application number 05 778 539.6, referred to in the following as the parent application, which was originally filed as an international application and published as WO 2006/065286 A1. The reason given for the refusal was that the subject-matter of the independent claims lacked novelty (Article 54 EPC).

II. In a communication accompanying a summons to oral proceedings dated 20 March 2015 the board informed the appellant inter alia that the independent claims defined subject-matter extending beyond the content of the parent application as originally filed, and thus contravened Article 76(1) EPC.

The appellant did not reply in substance to the communication of 20 March 2015.

Oral proceedings before the board took place on 19 June 2015, at which, as indicated in the letter dated 5 May 2014 (which was actually sent and received on 5 May 2015), the appellant was not represented.

The appellant requested in writing that the decision under appeal be set aside and further implicitly requested that a patent be granted on the basis of the application documents as originally filed.

III. Claim 1 according to the appellant's sole request reads as follows:

"A method for operating a transmitter that generates parity-check bits p=(p0, ..., pm-1) based on a current symbol set s=(s0, ..., sk-1), the method comprising the steps of:

receiving the current symbol set s=(s0, ..., sk-1);

using a matrix H to determine the parity-check bits; and

transmitting the parity-check bits along with the current symbol set;

wherein H is an expansion of a base matrix Hb via a model matrix Hbm,

wherein Hb comprises mb rows, a section Hb1 and a section Hb2, and Hb2 comprises column hb having weight wh>=3;

wherein 1's of hb and Hb1 are arranged such that one or more groups of the rows of Hbm can be formed so that rows of Hbm within each group do not intersect; and

wherein the rows of base matrix Hb can be permuted such that every two consecutive rows do not intersect."

IV. The appellant has not commented on the objection under Article 76(1) EPC raised in the communication of 20 March 2015.

Reasons for the Decision

1. The appeal is admissible.

2. Claim 1 of the present application differs from that of the parent application as originally filed inter alia in that it does not define that the matrix section Hb2 also comprises H'b2, which has a dual diagonal structure with matrix elements at row i, column j equal to 1 for i=j, 1 for i=j+1, and 0 elsewhere. That feature was not only defined in both independent claims of the parent application as originally filed, but was also indicated in the description as being essential to the claimed invention, since it formed part of the most general disclosure of the invention (at page 4, line 28 to page 5, line 6 of the publication WO 2006/065286 A1) and was also included in all of the detailed embodiments as described on pages 9 to 11. The board therefore concludes that the omission of this feature results in the claim defining subject-matter which extends beyond the content of the parent application as originally filed, contrary to the requirement of Article 76(1) EPC.

3. Therefore the appellant's sole request is not allowable, so that the appeal has to be dismissed.


For these reasons it is decided that:

The appeal is dismissed.

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