Filler and a process for the production thereof
CA 2444011 C · Owner: Aho, Outi · Inventors: Pitkanen, Maija; Hietanen, Soili; Aho, Outi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filler comprising cellulose or lignocellulose fibrils on which lightscattering ,material particles have been deposited and a process for the , manufacture thereof. In the filler according to the invention an alkyl , derivative of cellulose, such as CMC has been sorbed to the fibrils. Such a filler can be prepared from a source material containing cellulose or lignocellulose fibrils by first forming a fibril suspension into which there , are fed source materials forming an inorganic or organic salt that when , precipitating, forms a light-scattering pigment. The filler according to the invention has very good strength properties; in particular good bond strength , is achieved by means …
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 April 24, 2002 and granted March 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2024.
- 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.