Tyco Unit Challenges OxyContin Patents
Mallinckrodt Inc. filed its answer and counterclaims on Thursday in New York district court, asserting three affirmative defenses and four counterclaims. Two of the counterclaims seek declaratory judgment of noninfringement, and the other two seek declaratory judgment of invalidity and unenforceability.
Purdue's infringement suit centers on U.S....
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