(-)-ritodrine
CA 2116685 C · Owner: Kosugi, Isao · Inventors: Kosugi, Isao; Shibazaki, Yoshiaki; Niizato, Tetsutarou
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ritodrine, that is (-)-erythro-1-(phydroxyphenyl)-2-2-(p-hydroxyphenyl)ethylamino)-1propanol or a salt thereof substantially free from the (+)-isomer is disclosed. The compound has a strong suppressive effect on uterine contraction in comparison with (~)-ritodrine and (+)-ritodrine and has the same level of toxicity as these compounds, so that it can be used as a therapeutic agent of threatened premature birth and threatened abortion as well as a therapeutic agent of dysmenorrhea having a high safety.
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 June 30, 1993 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2015.
- 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.