No patent cliff, although I suppose there is some chance of another entrant down the line.
The only other vendor who has even submitted an ANDA for the Lovenox prefilled syringe is Amphastar, and we can surmise from various clues that the Amphastar ANDA is DOA. (HSP submitted a Lovenox ANDA for the vial formulation only, which is a minuscule portion of the US Lovenox market.)