[en] A general method to construct a mixing scheme of sequential light and heavy lepton states (sequentons in weak interactions in the framework of SU(n) symmetry group) with SU(2)xU(1) gauge group is proposed. SU(4) and SU(6) groups are considered in detail. It is shown, that the sequential introduction of heavy leptons in the SU(6)-symmetry with the use of existing physical data admits heavy lepton production in νN-collisions with the intensity of approximately(tgα)²x(α < or approximately THETAsub(c)). Other posible physical consequences of the proposed mixing schemes of lepton states, in particular, possible differences in coupling constant values of weak lepton decays are discussed too