Method for preparing bitumen base
CA 2616684 C · Owner: Vincent, Regis · Inventors: Lapalu, Laurence; Vincent, Regis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for preparing a bitumen base including the following essential steps: a) introducing a bitumen in a container equipped with mixing means and bringing the bitumen to a temperature of 120°C to 300°C; b) introducing at least one chemical blowing additive into the container and mixing, said chemical blowing additive being of general formula Ar1-R-Ar2 (I) wherein Ar1 and Ar2 independently of each other represent a benzene ring or a system of condensed aromatic rings of 6 to 20 carbon atoms substituted by at least one hydroxyl group and R represents an optionally substituted divalent radical whereof the main chain comprises 6 to 20 carbon atoms and at least one …
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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 July 28, 2006 and granted September 17, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 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.