[rayiner]

Enbrel didn't receive a patent extension.[1] In 2011, a patent was issued that covered certain aspects of Enbrel that had originally been applied for in 1990. Under the rules applicable to pre-1995 patents, the life of that patent runs 17 years from the date of issuance (or 2028). That could not happen under the current law. Patents issued after 1995 are only valid for 20 years from the date of filing, with current limited adjustments due to delays at the USPTO.

[1] There isn't really any such thing, at least as a way to resurrect patents that would otherwise expire.