Poly-beta-1-->4-n-acetylglucosamine
CA 2177823 C · Owner: Finkielsztein, Sergio · Inventors: Vournakis, John N.; Finkielsztein, Sergio; Pariser, Ernest R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing and purifying poly-.beta.-14-N-acetylglucosamine(p- GlcNAc)polysaccharide species and their derivatives is described. The polysaccharides produced by this method are free of proteins and , substantially free of single amino acids and other organic and inorganic , contaminants. These p-GlcNAc polysaccharides may be used commercially by the biomedical, pharmaceutical, and cosmetic industries in slow drug delivery systems, cell encapsulation systems, and treatments for the prevention of postsurgical adhesions. The figure shows the chemical structure of 100 % p-GlcNAc wherein "n" is an integer from about 4,000 to about 150,000.
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 1, 1994 and granted April 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2016.
- 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.