Erythromycin derivatives
CA 2117883 C · Owner: Sato, Tsutomu · Inventors: Takanashi, Hisanori; Sato, Tsutomu; Koga, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel compounds having the general formula (I):, wherein R1 is a hydrogen atom or an acyl group; R2 and R3 are the same or different and each represents a hydrogen atom, a hydroxyl group, an acyloxy group or an amino group, or, in combination, they represent =0 or =NOR10. where R10 represents a hydrogen atom or a lower alkyl group; R4 represents a hydrogen atom or a lower alkyl group; and Y represents NR5R6 or -N+R7R8R9Xwhere R5, R6, R7 R8 and R9 are the same or different and each represents a hydrogen atom or an unsubstituted or substituted lower alkyl group, lower alkenyl group, lower alkynyl group cycloalkyl group or 3-7-membered heterocyclic group comprising an …
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 May 26, 1993 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 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.