Use of zinc derivatives as cyclic ester polymerisation catalysts
CA 2443404 C · Owner: Ipsen Pharma S.A.S · Inventors: Bourissou, Didier; Cazaux, Jean-Bernard; Bertrand, Guy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the use of zinc derivatives of general formula (I) wherein: L¿1? represents a group of formula: -E¿14?(R¿14?)(R'¿14?)(R''¿14?) -E¿15?(R¿15?)(R'¿15?) or -E¿16?(R¿16?); E is an atom of group 15; L¿2? and L¿3? independently represent a group of formula: -E¿14?(R¿14?)(R'¿14?)(R''¿14?) -E¿15?(R¿15?)(R'¿15?) or -E¿16?(R¿16?) or together form a chain of formula -L'¿2?-A-L'¿3?-; A represents a saturated or unsaturated chain comprising one two or three elements of group 14; L'¿2? and L'¿3? independently represent a group of formula -E¿14?(R¿14?)(R'¿14?) -E¿15?(R¿15?) or -E¿16?-; E¿14? is an element of group 14; E¿15? is an element of group 15; E¿16? is an element of group 16; …
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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 9, 2002 and granted November 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2024.
- 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
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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.