NEW YORK - A pharmaceutical laboratory on May 1 filed a brief opposing bankrupt K-V Discovery Solutions Inc.'s attempt to reclassify certain bankruptcy claims, arguing that it has a valid claim for more than $4.12 million related to a patent that it says a division of K-V Discovery infringed (In Re: K-V Discovery Solutions Inc., No. 12-13346, Chapter 11, S.D. N.Y. Bkcy.).