Protein nonadsorptive membranes for wound dressings
CA 2083741 A1 · Owner: Braatz, James Anthony · Inventors: Grasel, Timothy Gerard; Letter, William Steven; Kehr, Clifton Leroy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Controlled release membranes are disclosed which are characterized by their biocompatibility and resistance to nonspecific protein adsorption. The membranes are particularly useful for delivery of proteinaceous materials in drug-delivery systems, i.e. wound dressings. Also disclosed are novel biocompatible protein-nonadsorptive hydrated polymers and method of producing the same.
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 November 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 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
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.