Hydrogels coated with steric or electrostatic spacers
CA 2433044 A1 · Owner: Herfert, Norbert · Inventors: Frenz, Volker; Majette, Thomas H.; Herfert, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to non-water soluble hydrogels which can swell in water and which are coated with steric or electrostatic spacers. Before being coated, the hydrogels comprise the following characteristics: absorbency under load (AUL) (0.7 psi) of at least 20 g/g and gel strength of at least 1600 Pa. The coated hydrogels preferably have the following characteristics: centrifuge retention capacity (CRC) of at least 24 g/g saline flow conductivity (SFC) of , at least 30 x 10-7 cm3 s/g and free swell rate (FSR) of at least 0.15 g/g s and/or a maximum vortex time of 160 s.
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 December 28, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2023.
- 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.