Posts Tagged: "horny goat weed"

Pfizer’s Erectile Dysfunction Claim for Viagra® Found Invalid

In the opinion, the BPAI agreed with the reexamination Examiner that any one of four (out of five) prior art references that contained descriptions of oral administration of the herb Yin Yang Huo (also known, perhaps not too surprisingly, as horny goat weed) are anticipatory prior art for claim 24. There were other rejections (double patenting rejections) that the Examiner set forth and that BPAI upheld. The patent claims cover the first commercially (wildly) successful male impotence drug Viagra®.