Cementitious compositions and their uses
CA 2225092 C · Owner: Imerys Minerals Limited · Inventors: Asbridge, Anthony Hales; Jones, Thomas Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition suitable for adding to water to produce a water-resistant hydraulic solid which composition comprises components (a), (b) and (c) as follows:, (a) calcium sulphate hemihydrate (b) portland cement;, (c) calcined clay having a pozzolamic activity; wherein the percentages by weight of components (a) (b) and (c) in the said composition are in the respective ranges:, (a) from 20% to 98%; (b) from 1% to 5%;, (c) from 1% to 30%; the percentages of components (a), and (b) and (c) adding to 100% in the three component composition.
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 18, 1997 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2019.
- 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.