Mochida doesn't have a USPTO issued patent for Epadel, so why wouldn't there be composition of matter claims? We don't know that V and E are exactly the same drug either.
"Claims A pharmaceutical composition comprising one or more fatty acids, at least 95% of which are in the form of ethyl-eicosapentaenoic acid, wherein the composition contains no docosahexaenoic acid and the composition is present in a capsule. The composition of claim 1 wherein the composition contains less than 3% of any fatty acid other than eicosapentaenoic acid. The composition of claim 2 wherein the capsule is a gelatin capsule. The composition of any one of claim 1, 2, or 3 wherein the ethyl-eicosapentaenoic acid is present in the composition in an amount of 250 mg to 1000 mg. A pharmaceutical composition comprising 250 mg to 1000 mg of fatty acids at least 95% of which are in the form of ethyl eicosapentaenoic acid, wherein the composition contains no docosahexaenoic acid, and the composition is present in a capsule. A pharmaceutical composition comprising 250 mg to 1000 mg of fatty acids at least 95% of which are in the form of ethyl-eicosapentaenoic acid, wherein the composition contains (a) less than 5% in aggregate of arachidonic acid and n-3 docosapentaenoic acid, and (b) no docosahexaenoic acid; and wherein the composition is present in a