As it turns out, there are as many origin stories for barbecue as there are spellings of the word on neon signs. These explanations range from a linguistic attempt to connect barbecue to boucan (also French) to a tall tale tracing barbecue to a Texas rancher who happened to brand the initials B.Q. on his livestock.
Patent protection usually ends when the patent expires. Here are the expiration dates: For all utility patents filed before June 8, 1995, the patent term is 20 years from date of filing, or 17 years from date of issuance, whichever period is longer.
Pfizer's patent protecting Viagra from generic competition expires in April 2020, but Teva Pharmaceuticals USA Inc. will be allowed to launch its generic version in the United States on Dec. 11, 2017.Teva Pharmaceuticals USA is a division of Israeli-based Teva Industries Ltd.ther drugmakers also are dealing with a wave of patent expirations that have hurt their revenue. The patent protecting another erectile dysfunction drug, Eli Lilly and Co.'s Cialis, also expires in 2017. 1  Pfizer to sell Viagra online, in first for Big Pharma: AP.