Cyclodextrin polymers and process for their preparation
CA 2079215 A1 · Owner: Schmitt-Sody, Wolfgang · Inventors: Schmitt-Sody, Wolfgang; Steinert, Wolfram; Staudinger, Guenther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to hydrophilic water-dilatable, cyclodextrin polymerizates with a high cyclodextrin content which possess good mechanical properties and to a process for producing them. The cyclodextrin pearl polymerizates according to the invention are produced by reacting hydroxylalkyl cyclodextrin derivatives with bifunctional crosslinking agents such as epichlorhydrin or diepoxides, followed by hydroxyalkylation of the primary product so obtained. The cyclodextrin polymerizates produced in this manner have mechanical properties appreciably superior to those of known comparable cyclodextrin polymers.
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 March 22, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2013.
- 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.