Dispersion of plant pulp in concrete and use thereof
CA 2237655 C · Owner: Hsu, Jer-Wen · Inventors: Hsu, Jer-Wen; Soroushian, Parviz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The wet pulp derived from wood, plants or waste paper is dried to a relatively low density with limited bonding developed between fibers. The resulting dried pulp is conveniently broken up, using limited mechanical energy and without substantially damaging the fibers, into individual fibers for use as reinforcement in cement-based materials.
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 November 15, 1996 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 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.