I'm afraid I don't get your point. Isosorbide dinitride costs about US-35$-75$ [1] and IN-0.4$ [2], about 100 tablets in both cases. The patent was published in

I'm afraid I don't get your point. Isosorbide dinitride costs about US-35$-75$ [1] and IN-0.4$ [2], about 100 tablets in both cases. The patent was published in 1979, so it should have long expired by now, and would be a generic drug[3]. Whatever the German company spent on R&D would have been recovered before the patent expired. [1] http://www.goodrx.com/isosorbide-dinitrate http://www.goodrx.com/isosorbide-dinitrate [2] http://medlineindia.com/cardiovascular/isosorbide_dinitrate.htm http://medlineindia.com/cardiovascular/isosorbide_dinitrate.... [3] http://www.google.com/patents/US4156736 http://www.google.com/patents/US4156736