Equipped with the common general knowledge of the relevant technological field, the unimaginative skilled technician must look at available art, being careful not to engage in an ex post facto analysis, and determine whether the invention would be arrived at directly and without difficulty: Anderson v. Les Machineries Yvon Beaudoin Inc. (1994), 58 C.P.R. (3d) 449 (F.C.T.D.).
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