Ultra high-strength hydraulic cement compositions
CA 2107268 C · Owner: Takemoto Yushi Kabushiki Kaisha · Inventors: Nakazima, Makoto; Mitsui, Kenrou; Yamamoto, Tsuneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ultra high-strength hydraulic cement compositions with extremely low water-to-cement ratio of 10-30% and having high fluidity and improved capability of preventing slump loss from which high-quality ultra high-strength hardened concrete and mortar can be obtained with superior workability contain a binder composed of cement or a mixture of cement and a microscopic powder admixture aggregates, water and a cement dispersion agent composed of water-soluble vinyl copolymers obtained by aqueous solution radical polymerization of four or five specified kinds of monomers at a ratio within a specified range. The unit content of the binder is 400-1300kg/m3 the water-to-binder ratio is 10-30% and the …
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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 September 29, 1993 and granted October 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 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.