Suppression of parathyroid hormone synthesis and secretion
CA 2013166 C · Owner: Chugai Seiyaku Kabushiki Kaisha · Inventors: Slatopolsky, Eduardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A treatment of hyperparathyroidism with use of a vitamin D3 derivatiave of formula (I): (see formula I), wherein R1, R2 and R3 which may be the same or different, each represents a hydrogen atom or a hydroxyl group; and R4.is hydrogen or a C4-6 alkyl group that is optionally substituted by a hydroxy group is disclosed. A pharmaceutical composition comprising a vitamin D3 derivative of formula (I) is useful for treatment of hyperparathyroidism particularly secondary hyperparathyroidism.
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 March 27, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2012.
- 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.