(carboxyl)alkyloxyalkyl derivatives of cyclodextrins
CA 2104097 A1 · Owner: Janssen Pharmaceutica Naamloze Vennootschap · Inventors: Jicsinszky, Laszlo; Szejtli, Jozsef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyclodextrin ethers or mixed ethers wherein one or several hydroxy groups of the cyclodextrin moiety are etherified with mono- or dihydroxyalkyl and in the case of mixed ethers one or more of, the remaining hydroxy groups of the cyclodextrin moiety are further etherified with (carboxyl)alkyl or (derivatized carboxyl)alkyl and wherein one or more of the hydroxy groups of said mono- or dihydroxyalkyl groups are further etherified with (carboxyl)alkyl or (derivatized carboxyl)alkyl; the alkylcarbonylated derivatives thereof; the non-toxic metal and amine salt forms thereof; and the stereochemically isomeric forms thereof. Process for preparing said cyclodextrin derivatives. Cyclodextrin …
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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 February 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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
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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.