5-o-desosaminylerythronolide a derivatives
CA 2118489 C · Owner: Morimoto, Shigeo · Inventors: Kashimura, Masato; Misawa, Yoko; Morimoto, Shigeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Object: To provide novel macrolide antibiotics having a strong antibacterial activity. Constitution: 5-O-desosaminylerythronolide A derivatives represented by the formula: (see fig. I), wherein -A~ is a group of -N(R3)- (wherein R3 is a hydrogen atom or an alkyl group having 1 - 3 carbon atoms) or a group represented by -N=, and R1 and R2 are each a hydrogen atom or an alkyl group having 1 - 3 carbon atoms which is a tricyclic carbamate of 5-O-desosaminylerythronolide A derivative having a ketone at the 3-position, being substituted by a methoxy group at the 6-position, and a pharmaceutically acceptable acid addition salt thereof; and a compound represented by the formula:, (see fig. II), …
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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 April 21, 1993 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 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.