Judge allows sales of Momenta drug copy

Bloomberg News/File
Momenta gets revenue from generic Lovenox sold by partner Novartis AG’s Sandoz unit.

Shares of Momenta Pharmaceuticals Inc., a Cambridge company that owns patents on the blood-thinner Lovenox, fell after a court cleared the way for Watson Pharmaceuticals to sell a generic version of the drug. The US Court of Appeals for the Federal Circuit granted Watson partner Amphastar Pharmaceuticals a stay of an order that prevented sales. A US judge in Boston blocked sales of the drug copy, saying Momenta was likely to win a patent-infringement suit it had filed. The Federal Circuit said its order “does not represent a final decision’’ on the merits of the appeal.