MeV Properties of the γ-ray Blazars PKS1622-297, 3C454.3 and CTA102

The MeV-properties of the blazars PKS 1622-297, 3C 454.3 and CTA 102 have been analyzed using COMPTEL data (0.75-30 MeV).Our results show significant detections of PKS 1622-297(5.9σ)in the 10-30MeVb and during itsγ-ray flare in1995, andof 3C 454.3 (5.6 σ)in the sum of 8 years observations in the 3-10 MeV band.By comparing the MeV results to the ones obtained in neigh boring bands by the Compton Gamma-Ray Observatory (CGRO) experiments EGRET and OSSE, we reveal some properties of these 3 blazars at γ-ray energies.