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I have pulled the highlights(not included applicant's arguments) of >5 year prosecution history of Lovaza's patent# 5502077 (Link) from USPTO's PAIR site. See the 4 Non-Final-Rejections(nfj) and 3 Final Rejections(fj), Appeals and the final allowance.
This patent(expiring in 05/2013) has until now protected the exclusivity of Lovaza. If you read the rejections they are because of obviousness (prior art - sutherland et al, cornieri et al) which is what Amarin is going through for it's IP on AMR101.
There has been some "sensational" headlines and tweeting on Amarin's IP prosecution history and I have posted this below to put things in perspective. I am not saying Amarin's patent claims will finally receive allowance..just trying to put things in perspective.