Oral contraceptive preparation having a first phase comprising progestin/estrogen and a second phase comprising progestin
CA 2301162 A1 · Owner: American Home Products Corporation · Inventors: Gast, Michael Jay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a method of contraception which comprises administering to a female of child bearing age for 28 days per menstrual cycle a combination of a progestin at a daily dosage equivalent to 30-150 µg levornorgestrel and an estrogen at a daily dosage equivalent to 10-20 µg ethinyl estradiol for 23-25 days beginning on day 1 of the menstrual cycle followed by administering a progestin at a daily dosage equivalent to 10-100 µg levornorgestrel for 3-5 days.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.