Ladd v Marshall [1954 EWCA Civ 1; MMI Research v Cellxion [2012] EWCA Civ 7).Brian also reminded the audience of the three categories of amendments recognised by Jacob LJ in Nikken v Pioneer [2005] EWCA Civ 906:(a) before a trial; (b) after trial, at which certain claims have been held valid but other claims held invalid, the patentee simply wishing to delete the invalid claims (I would include here also the case where the patentee wishes to re-write the claims so… [read post]