Providing freezing and thawing resistance to cementitious compositions
CA 2611968 C · Owner: Construction Research & Technology Gmbh · Inventors: Kerns, Michael L.; Christensen, Bruce J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved freeze-thaw durability cementitious composition is provided that uses' at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture . The degradable polymeric particles provide void spaces in the cementitious material matrix and such , void spaces act to increase freeze-thaw durability of the cementitious material . Preferred polymers are polylactic PLA or polyglycolic PLG acid.
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 June 9, 2006 and granted June 5, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.