Recycled rubber in a polymer modified asphalt and a method of making same
CA 2110697 C · Owner: Causyn, David W._& Kristina Thys · Inventors: Thys, Krystina__& David Causyn; Causyn, David W._& Kristina Thys
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved paving composition includes between 89 - 93 % graded aggregate 5.76 % asphalt cement, 0.24 % SBR polymer and 1 - 5 % graded recycled crumb rubber. The asphalt cement and SBR polymer are blended and heated to form a first mixture. The aggregates are blended and heated to form a second mixture. The two mixtures are blended together prior to the addition of the graded recycled crumb rubber.
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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 June 5, 1992 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2014.
- 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.