Using branched polymers to improve the storage stability of acid treated polymer modified asphalts
CA 2039486 C · Owner: Imperial Oil Limited · Inventors: Moran, Lyle Edwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a composition arid method for improving the storage stability of acid treated polymer modified asphalts. More specifically the storage stability of an asphalt which contains greater than 1.0 wt.% polymer can be improved by adding a branched, rather than a non branched polymer to an, asphalt which has previously been reacted with an inorganic acid. The storage stable acid treated branched polymer modified asphalt thus produced is particularly well suited for use as a binder in paving materials and as a coating or saturant for roofing shingles.
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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
- Filed March 28, 1991 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2013.
- 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
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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.