Unfortunately, you can't import the mesh from Hypermesh to MSC.Patran, because the program developed by MSC.Software Corporation is not supported. As you can see on the official web page, Hypermesh can work only with CATIA, FiberSim, IGES, JT, Parasolid, ProE and CREO, SolidWorks, STEP, Tribon and UG. You can try to export the mesh on your desktop (File > Export) using a standard format and then import it MSC.Patran (File > Import/Open).