The Federal Circuit had the occasion to revisit the proper application of the on-sale bar under 35 U.S.C. 102 in ANDA litigation over claim 4 of U.S. Patent No. 6,441,168 , which reads: A crystalline calcium salt of 5-methyl- -tetrahydrofolic acid [MTHF] with 2 theta values of 6.5, 13.3, 16.8 and 20.1 said crystalline salt having a water of crystallization of at least one equivalent per equivalent of 5-methyltetrahydrofolic acid.
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