Asphalt composition
CA 1321276 C · Owner: Cheng, John W. · Inventors: Watson, R. David; Cheng, John W.; Somogyvari, Arpad F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel asphalt composition consisting of from 95% to 97% w/w of asphalt, said asphalt having a penetration range at 25°C between about 240 dmm and about 400 dmm from 3% to, 5% w/w of a styrene-butadiene-styrene block copolymer and from 0.08% to 0.12% w/w of sulphur calculated on the combined weight of asphalt and polymer. The composition is useful in hot mixes for road surface courses and in overlays.
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 August 10, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 10, 2010.
- 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.