  We report on our present work, where by means of the Inverse Amplitude Method
we unitarize the elastic pion nucleon scattering amplitudes of Heavy Barion
Chiral Perturbation Theory at O(q^3). We reproduce the scattering up to the
inelastic thresholds including the Delta(1232) resonance. The fitted chiral
constants are rather different from those obtained by fitting the extrapolated
threshold parameters for the non-unitarized theory.
