<prompt> Ukukhiqiza inguqulo eyinkimbinkimbi yalesi sigwebo ukuvikelwa kwe-patent ye-Pfizer ku-Norvasc kwahlala kuze kube ngu-2007.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi Ukuvikelwa kwe-patent ye-Pfizer ku-Norvasc kwaqhubeka kwaze kwaba ngu-2007, ukuphela kwe-patent ephelele kwenzeka kamuva ngo-2007. 