Method for the production of improved paving asphalt and product prepared therefrom
CA 2183218 C · Owner: Kamel, Nabil · Inventors: Miller, Laverne; Kamel, Nabil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paving asphalt cement for use in preparing a paving asphalt comprises from about 5 to about 90 weight % of a catalytically oxidized paving asphalt precursor, from about 10 to about 95 weight % of a unoxidized paving asphalt precursor and from about 1 to about 25, weight % of a heavy vacuum gas oil.
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 August 13, 1996 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2018.
- 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.