In this paper we study the dissipativity which is associated with the invariant measures for dissipative dynamical systems generated by nonlinear neutral delay differential equations of Hale's type (HNDDEs). Several new and useful dissipativity criteria are presented for nonlinear non-autonomous HNDDEs by using a generalized Halanay inequality. Two examples of concrete dynamical systems, one arises from the transmission line problem and the other is a no...