Combined asphalt plant and soil remediation system
CA 2176025 A1 · Owner: Astec Industries, Inc. · Inventors: Brock, J. Donald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for heating and drying stone aggregate used in the production of asphalt which also remediates and disposes, of contaminated soil. Aggregate is introduced into a drum chamber (36) of a fixed sleeve rotary drum mixer (34) for heating. The aggregate is discharged into an annular chamber (70) and mixed with contaminated soil that has been processed to be suitable for use in asphalt. As the soil is heated, the contaminants are vaporized and drawn into the drum chamber (36) where they are oxidized by high temperature. Secondary aggregate in the form of recycled asphalt pavement (RAP) and/or virgin aggregate are also added to the annular chamber (70) and mixed with 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 November 1, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2016.
- 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.