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.
The first patent is set to expire in December 2020. This is the earliest predictable date that a generic version could become available. However, other circumstances could come up to extend or shorten this exclusivity period. This could include such things as lawsuits or other patents for new Xarelto uses.