The new Enbrel patent (#8,063,182) expires 17 years from the issue date (today), rather than 20 years from the filing date, because it was filed on 5/19/95, a few days before US patent law changed to the 20-year system on 6/9/95.
“The efficient-market hypothesis may be
the foremost piece of B.S. ever promulgated
in any area of human knowledge!”