Canadian application, no grantCanada
Process for the preparation of porous, hydrophilic, highly swellable hydro-gels
CA 2201213 A1 · Owner: Riegel, Ulrich · Inventors: Riegel, Ulrich; Funk, Rudiger; Herfert, Norbert
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present application relates to a process for the preparation of porous hydrophilic, highly swellable hydrogels which comprises freeze-drying hydrophilic highly swellable hydrogels which have been swollen with water.
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 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 27, 1997
GrantedNo grant recorded
Term endedMarch 27, 2017
Patent numberCA 2201213 A1
Classification (IPC)C08L101/14 +2 more
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.