Tuesday, 11 April 2017

T 1543/12 - Multiple ranges in claim, are all combinations supported?

Many independent combinations are possible

Claim 1 in this opposition comprises a number of ranges. Individually, each of the ranges is supported by the application, but there may be combinations of the ranges that are not. Is such a claim properly supported over its entire width? The board thinks it is.  
Claim 1 in the pending requests contained a number of ranges:
1. A method for preparing a dry granulated product containing L-lysine and having the following composition:
L-lysine content in solid matter: 40 to 85% by weight equivalent ratio of anion/L-lysine 0.68 to 0.95 moisture content: 5% by weight or less (...)
Reasons for the Decision
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4. Insufficiency of disclosure (Article 100(b) EPC)
4.1 The Appellant objected that the subject-matter of claim 1 could not be carried out over the whole range claimed. The claimed process is directed to the preparation of products covering the whole range of claimed lysine contents. However, it was not possible to produce lysine products having a lysine content of 85% and an equivalent ratio of more than 0.71, although an equivalent ratio of 0.68 to 0.95 was claimed.
4.2 According to Article 100(b) EPC, the European patent must disclose the invention in a manner sufficiently clear and complete for it to be carried out by the skilled person.
4.3 In the present case the process according to claim 1 is characterized to produce a L-lysine product. This product is inter alia characterized by a moisture content up to 5% by weight, of a L-lysine content in the final product of 40 to 85% by weight and an equivalent ratio of anion/L-lysine of 0.68 to 0.95. Therefore, any L-lysine fulfilling these three parameters is a product according to the invention. In order to be carried out over the whole range claimed, it is only necessary that each value within the claimed ranges can be achieved individually. It is, however, not a requirement of Article 83 EPC, that each and every possible combination of all individual limiting values within the claimed ranges can be achieved. The example given by the Appellant is technically impossible, since a product comprising 85% by weight of L-lysine can only comprise 15% by weight of an anion forming compound, which in the present case is hydrochloric or sulfuric acid. It follows that depending on the molecular weight of the acid used in the process the ratio of anion/L-lysine can reach only certain theoretical values within the claimed range. The skilled person knows, that both the L-lysine content in the final product and the achievable ratio of anion/L-lysine are dependent on each other and cannot vary independently over the whole range of values claimed for each of these two parameters.
4.4 Therefore, the Board concludes that the European patent discloses the invention in a manner sufficiently clear and complete for it to be carried out by a skilled person in the sense of Article 83 EPC.
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This decision T 1543/12 (pdf) has European Case Law Identifier:  ECLI:EP:BA:2016:T154312.20160419. The file wrapper can be found here. Photo by Bill Ferngren (Braite), via PixaBay under a CC0  license (no changes made).

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