Asphalt drum mixer with scoop-like mixing tips
CA 2176243 A1 · Owner: Astec Industries, Inc. · Inventors: Milstead, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An asphalt drum mixer (10) includes a rotating drum (12) within a fixed sleeve (32) which defines an annular chamber (34) and, mixing tips (50, 58) mounted on the drum and in the annular chamber. The mixing tips (50 58) pass through the hot mix asphalt laying in the bottom of the annular chamber (34) and mix and shear the hot mix asphalt and increase its residence time in the drum mixer (10). In one embodiment the mixing tips may comprise curved scoop-like elements (50) which lift the hot mix asphalt higher than conventional paddles and greatly increase residence time of the mix in the drum (12) over conventional paddles. The quality of the mix is thus greatly improved. In another …
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 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.