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When does Viagra patent expire?

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Does anyone know when the viagra patent expires? I've seen reference to March 2012, and also dates as far off as 2016 and 2019. I'm really curious as to when legitimate generic viagra will be available at U.S. pharmacies as I'm just not comfortable buying from online overseas outfits.
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First Helper danrs
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replied April 3rd, 2012
Viagra patent expiry
From what I can gather, Viagra's exclusivity patent now runs until 2020. But the patent on the active ingredient, sildenafil, apparently expires in September, after the FDA gave it a six-month extension recently. I guess that means Viagra itself (Pfizer's) will still be expensive but generic sildenafil - with a different chemical makeup than Viagra - will be relatively cheap.
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