Asphalt modifier and asphalt composition containing said modifier
CA 2218228 A1 · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Yamaguchi, Noboru; Fujita, Harunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an asphalt modifier containing an ethylene copolymer having a repeating unit derived from ethylene and a repeating unit derived from an epoxy group-containing compound or an ethylene copolymer having a repeating unit derived from ethylene a repeating, unit derived from an epoxy group-containing compound and a repeating unit derived from an ethylenically unsaturated ester, both copolymer having a melt flow rate of 50 to 1000 g/10 minutes, which is superior in solubility in asphalt and, an asphalt composition containing the modifier.
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 October 14, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2019.
- 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.