Abbott Laboratories is suing India's Ranbaxy Laboratories as well as Israel's Teva and Sandoz of the Novartis group, in Chicago for allegedly violating its patents protecting Omnicef, a drug used to treat ear, throat and skin infections.
A copy of the letter dated February 29 was released to the media.
Piramal Healthcare, which recently sold its domestic formulations business to Abbott Labs for about Rs 18,000 crore (Rs 180 billion), has announced a bonus payment of up to six months' salary to its employees.
Piramal Healthcare is planning a string of acquisitions in the biotech space in the US, Europe and Canada in the next two to three years.
According to analysts, Glenmark will have to pay a penalty of $16 million, following the latest verdict.