Cellulosic fibres
CA 2125291 C · Owner: Convatec Limited · Inventors: Bahia, Hardev Singh; James, Jim Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carboxymethyl cellulose fibre having a degree of substitution of at least 0.1 preferably 0.2-0.5, carboxymethyl group per glucose unit, is derived from solvent-spun cellulose fibre for example by , reaction with a strong alkali and a monochloroacetate reagent. The fibre has an absorbency of at least 8 grams usually at least 15 , grams, 0.9 % saline solution per gram of fibre and a tenacity of at least 10, usually at least 15 cN/Tex. It can be used for , absorbent personal products.
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 9, 1992 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.