Anhydrous crystal of 4-carbamoyl-1-.beta.-d-ribofuranosyl imidazolium-5-oleate
CA 2028416 C · Owner: Asahi Kasei Kogyo Kabushiki Kaisha · Inventors: Ozeki, Shinji; Nakatsugawa, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Anhydrous crystals of 4-carbamoyl-I-.beta.-D-ribofuranosyl imidazolium-5-oleate are disclosed. The crystals possess (1) water content of 0.5% by weight or less (the Karl Fischer method), and (2) specific IR spectrum absorption peaks in the neighborhoods of 3580, 1852, 1630, 1575 and 1554 cm-1. They are stable against heat and high humidity conditions and can easily be manufactured by using ethanol. The compound has superior immuno-suppressing activity and is thus made into preparations for oral administration.
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 October 23, 1990 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 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.