Section 324. Effect of recording assignment of mortgage

The recording of an
  assignment of a mortgage is not in itself a notice of such assignment to
  a  mortgagor,  his  heirs or personal representatives, or to an owner of
  the mortgaged premises where such assignment is recorded  subsequent  to
  the recording of the conveyance of such premises to such owner, so as to
  invalidate  a  payment  made  by either of them to the mortgagee or to a
  prior assignee of the mortgage.