The test to be applied in deciding whether an application discloses matter extending beyond that disclosed in the application as filed, or whether the specification of a granted patent discloses matter extending beyond that disclosed in the specification as filed, is whether the patentee has disclosed either by deletion or addition any inventive concept which was not disclosed before1. For example, deletion of an essential feature from a claim may result in the amended claim disclosing a materially different invention from that disclosed in the specification and claims of the application, with the result that the invention disclosed after
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