Some properties of a closed concircular almost contact manifold

We consider a skew symetric conformal vector fleld on a closed concircular almost contact manifold M and flnd its properties. Also, for a CR-product submanifold M 0 of M, the mean curvature vector fleld of the invariant submanifold and the ∞atness of the antiinvariant submanifold are studied, under the assumption that M 0 admits a skew symmetric Killing vector fleld tangent to the invariant submanifold, such that its generative is tangent to the antiinvariant submanifold.