Method of producing collagen particles, and the use of such particles as substrates for active substances
CA 2097801 C · Owner: Scherer, Dieter · Inventors: Roreger, Michael; Scherer, Dieter; Muller, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process for the production of cross-linked collagen particles whose size lies in the micro and nanometer range, in which a solution or dispersion of collagen in water is distributed finely in discrete droplets in a waterimmiscible organic phase whereby emul-, sifying agents are added a water-in-oil emulsion thereby, being formed the collagen being subsequently cross-linked in the interface of the droplets, using a cross-linking agent, and the collagen particles produced in this manner being purified and isolated by separating the organic phase and washing.
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 21, 1991 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 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.