Schein's Lopressor patent challenge
Ciba-Geigy states in a letter to "The Pink Sheet" that Scheins challenge of its Lopressor patent in 1987 "was not resolved in Ciba- Geigy's favor" but "Ciba-Geigy does retain patent exclusivity for metoprolol tartrate until December 1993." A recent article (July 6, T&G-3) attributes a statement to Ciba-Geigy that the lawsuit was resolved in its favor. Apparently, the settlement agreement for the 1987 lawsuit included a confidentiality provision. In addition, Schein's prospective approval for metoprolol in 1989 was the drug's first generic approval.
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