T 0992/12 (Disclaimers and clarity / PROCTER & GAMBLE) 27-04-2015

Summary of Facts and Submissions

I. This appeal is from the decision of the Examining Division to refuse European patent application

no. 06124858.9.

II. Claim 1 of the set of sixteen claims pending before the Examining Division as the sole request (filed with letter of 21 October 2011) reads as follows (amendments to claim 1 of the application as filed made apparent by the Board):

"1. A composition comprising a modified cellulose derivative having a molecular weight from 20000 to 500000 kDaltons or mixtures thereof and a cellulase enzyme characterised in that the weight ratio of the modified cellulose derivative to the active cellulase enzyme protein is from [deleted: 1:1] 20:1 to 10000:1 and wherein the composition does not contain 0.7 to 0.9 % by weight of the total composition, of sodium nonanoyl oxybenzene sulfonate, and does not contain 10% by weight based of the total composition, of sodium perborate monohydrate, in which the enzyme is a bacterial alkaline enzyme exhibiting endo-beta-1,4-glucanase activity (E.C.3.2.1.4)."

Said request also comprises an amended description page 2 filed together with claims 1 to 16.

III. In its decision the Examining Division found that said claim 1 lacked clarity and conciseness as required by Article 84 EPC since it contained two negative technical features (below disclaimers) defining what the claimed composition should not contain, namely neither "0.7 to 0.9% by weight of sodium nonanoyl oxybenzene sulfonate" (below NOBS) nor "10% by weight of sodium perborate monohydrate" (below PBM).

The Examining Division in its decision:

a) referred to the Guidelines for Examination in the EPO (the valid version thereof at the date of the decision being that of April 2010), where it is stated at point C-III 4.20, inter alia, that "negative limitations such as disclaimers may be used only if adding positive features to the claim either would not define more clearly and concisely the subject-matter still protectable ... or would unduly limit the scope of the claim";

b) quoted a passage taken from point 3 of the Reasons of the Decision of the Enlarged Board of Appeal G 1/03 (OJ of EPO 2004, p.413):

"...the requirements of conciseness and clarity of Article 84 EPC are also applicable to claims containing disclaimers. On the one hand, this means that a disclaimer is not allowable if the necessary limitation can be expressed in simpler terms in positive, originally disclosed features in accordance with Rule 43(1) [sic] EPC 2000 [sic]. In addition, a plurality of disclaimers may lead to a claim drafting which puts an unreasonable burden on the public to find out what is protected and what is not protected";

and

c) also referred to further passages at points 2.5.1 and 2.5.2 of the same decision G 1/03, indicating that a disclaimer directed to the exclusion of non-working embodiments should not be allowed since it was neither necessary nor appropriate.

d) Moreover, the Examining Division considered relevant that, in the present case, no reasons for the inclusion of the disclaimers in claim 1 were indicated in the application as filed and, thus, it was not known whether they were supposed to exclude non-working embodiments, to exclude the disclosure of a piece of prior art, or for some other undisclosed reason. Nor had the reasons for the inclusion of the disclaimers been later rendered available to the public, since they were only contained in a passage of a letter (dated 21 October 2011) that the Applicant had requested the Examining Division to be kept confidential.

Since the public had no access to this information, there was no "full public disclosure of the invention and the reasoning behind the claim formulation".

In view of the absence of such information, the Examining Division held that claim 1 at issue could be worded more concisely in terms of positive features, whereas the present drafting of claim 1 appeared "to place an unreasonable burden upon the public with regard to the determination of the boundaries of the scope of protection conferred by said claim" (page 3, last but two paragraph of the decision under appeal).

e) The Examining Division, therefore, concluded (see second paragraph on page 4 of the decision's grounds) "that claim 1 comprises features which should not normally be allowed under Guidelines C-III 4.20, and therefore the requirements of clarity and conciseness as required by Article 84 EPC are considered to have not been met".

f) It finally pointed out (page 4, third paragraph the decision) that page 17 of the description of the application also disclosed that NOBS and PBM were "present in ranges which conflict with the disclaimer of claim 1 thus also bringing about a lack of clarity".

In view of the above the Examining Division decided to refuse the application.

IV. In its statement setting out the grounds of appeal, the Appellant (Applicant) rebutted the reasoning of the Examining Division.

With this statement it also filed an amended version of page 17 of the description of the patent application.

V. In its statement of grounds of appeal the Appellant requested that the decision under appeal be set aside and "the patent proceed through examination to grant".

VI. The Appellant's arguments can be summarised as follows:

The Examining Division had erroneously decided that the negative limitations in claim 1 at issue were objectionable under Article 84 EPC, since said limitations were clear and concise. A skilled person would immediately understand that the claimed invention included compositions having the positive limitations in the claim unless such compositions also included the negatively-defined features. These negatively-defined features could be determined by a simple assessment of the quantity of two clearly defined ingredients in the composition, in the same way that quantitative amounts of positively defined ingredients were determined. Hence, present claim 1 also placed no undue burden on upon the public.

According to the cited Guidelines C-III 4.20 a claim may be restricted by a negative limitation if adding positive features to the claim either would not define more clearly and concisely the subject-matter still protectable or would unduly limit the scope of the claim. This was the case in the present instance: there was no positive limitation that could be used to more clearly define the subject-matter still protectable and any positive limitation would unduly restrict the scope of the claim.

Decision G 1/03 relied upon by the Examining Division related to amendments which add "undisclosed" disclaimers during prosecution. In the present case, the disclaimer was present in the application as filed, so the circumstances were not at all the same. Indeed, at the beginning of point 2 of G 1/03 it was clearly stated that "the term "disclaimer" is used hereafter as meaning an amendment to a claim resulting in the incorporation therein of a "negative" technical feature, typically excluding from a general feature specific embodiments or areas".

The Appellant stressed that the absence in the application as filed of the reasons for which the claim comprises disclaimers did not result in a lack of clarity and or conciseness of claim 1.

Also the request for confidentiality for one paragraph of the Applicant's letter of 21 October 2011 was no request for confidentiality relating to the disclosure of the invention as set out in the patent application.

Article 83 EPC required the invention to be disclosed in a manner sufficiently clear and complete for it to be carried out by a person skilled in the art. However, there was no requirement in Article 84 or anywhere else in the EPC to give the reasons for the manner in which an Applicant drafted the patent claims.

Hence, claim 1 at issue met the requirements of Article 84 EPC.