The 0.03% Lumigan formulation is patent protected until 2014 and the 0.01% formulation until 2027. I think the 0.03% formulation still counts for majority of sales and from the link you've posted it looks like WPI is challenging both formulations patents but my guess is they will not bother challenging the older patents and will attack the later patent protecting the 0.01% (U.S. 7,851,504).
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