https://patentbrief.org/company/syntex-sa Plain-English explanations of patents assigned to Syntex SA, newest first. en-us Sat, 13 Jun 2026 10:07:21 GMT https://patentbrief.org/patent/us/2744122/birth-control-pill-norethindrone A 1952 patent for a synthetic hormone that became the active ingredient in the first effective oral contraceptive pill. Tue, 01 May 1956 00:00:00 GMT https://patentbrief.org/patent/us/2744122/birth-control-pill-norethindrone