8a-aza-8a-homoerythromycin cyclic iminoethers
CA 2065674 A1 · Owner: Merck & Co. Inc. · Inventors: Wilkening, Robert R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
190/FGP89, 191/FGP90, 18300IA, TITLE OF THE INVENTION 8a-AZA-8a-HOMOERYTHROMYCIN CYCLIC IMINOETHERS ABSTRACT OF THE INVENTION, Cyclic iminoethers of the general structural formula wherein one of the R groups is hydrogen and the other R group represents a bond between the oxygen atom at C-6 or C-12 and the imino carbon at C-9:, , and, These compounds axe macrolides useful as antibiotics and as intermediates for the synthesis of other macrolide antibiotics.
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 April 9, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2014.
- 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.