A raw membranous material for medical materials and manufacturing methods thereof
CA 2173547 C · Owner: Nakagawa, Tokuzo · Inventors: Yui, Tooru; Kondoh, Kazuo; Nakagawa, Tokuzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a raw membrane material for medical materials, which is of acellular nature and consists essentially of a compact layer with a characteristic matrix structure retained and which is produced by dissolving and removing cellular layers including epithelium and fibroblast layers from biogenic connective tissue membrane which comprises epithelial, basement membrane compact and, fibroblast layers. To remove epithelium and fibroblast layers, biogenic connective tissue is treated with an aqueous solution of a quaternary ammonium salt of the formula: C6H5CH2N(CH3)2R+Cl- (wherein R is an alkyl group of 8 to 18 carbon atoms) and then with thiolprotease which is a glycoprotein and has a …
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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 April 4, 1996 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2018.
- 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.