Bituminous compositions and preparation thereof
CA 1262976 C · Owner: Esso Societe Anonyme Francaise · Inventors: Plaindoux, Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A road surface dressing composition is made by (a) blending together at a temperature of 140 to 200°C (i) a bitumen fluxed with a, petroleum derived aromatic oil to a penetration of over 220 (mm/10) (ii) a styrene-butadiene copolymer; (b) mixing the resultant blend for at least 10 minutes at a temperature of 150 to 190°C with 0.01 to 0.6% of sulfur based on the weight of the bitumen content of the said fluxed bitumen; and (c) mixing the resultant product at a temperature of 125 to 150°C with a light fluxant, preferably hydrocarbonaceous to, decrease the final viscosity of the composition to a required value.
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
- Granted November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 2006.
- 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.