Composite product based on fibers and fillers, and process for the manufacture of such a novel product
CA 2093545 C · Owner: Cousin, Laurent · Inventors: Mora, Fernand; Cousin, Laurent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel composite product which is composed of a fibrocrystalline heterogeneous structure consisting of: ~ on the one hand a plurality of fibers of expanded specific surface area and of hydrophilic character having a substantial quantity of microfibrils on their surface, and, ~ on the other hand crystals of precipitated calcium carbonate (PCC), organised essentially in clusters of granules, the majority of which trap the micro-fibrils and are joined directly thereto by mechanical bonding. - Application to the field of construction materials and papermaking.
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 6, 1993 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2015.
- 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.