Method and apparatus for foaming of bitumen
CA 1279446 C · Owner: Wentzel, Jarle · Inventors: Wentzel, Jarle; Aune, Einar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A C T :, A method and an apparatus for foaming of bitumen. Liquid bitumen at a temperature of 120 - 160°C is mixed with 1 - 3 % by weight of water in a mixing device (8) at a pressure which is higher than the saturation pressure of water vapor at the temperature of the hot bitumen. From the mixing device the mixture is allowed to expand through a valve (10) such as a throttle valve, the resulting evaporation of the water in the mixture causing the desired foaming of the bitumen.
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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
- Granted January 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 2008.
- 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.