A federal jury in Newark, N.J., has found, after a 14-day trial, that three generic drugmakers infringed Pfizer Inc.’s patent on its acid-reflux drug, Protonix.

The jury found on April 23 that Teva Pharmaceuticals USA Inc., Kudco Ireland Ltd. and Sun Pharma Global Inc. infringed on the patent when they filed applications with the Food and Drug Administration to sell generic versions of Protonix.