TEVA patent expir Sept 2015 Maybe: en.wikipedia.org/wiki/Term_of_patent_in_the_United_States The longer of (a) 20 years after the May 22, 1995 filing date on ip.com/patent/US5800808 patent 5800808 or (b) 17 years after the issue date of Sept. 1, 1998, despite what the OB says.