Mixtures of bitumen and olefin polymers suitable for modifying bitumens
CA 2219005 A1 · Owner: Sartori, Franco · Inventors: Braga, Vittorio; Sartori, Franco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures comprising bitumen and at least one polymer selected from (A) an essentially atactic propylene homopolymer (B) an amorphous propylene , copolymer with a C4-C10 .alpha.-olefin and (C) an amorphous propylene , copolymer with ethylene; said polymers (A) and (B) having the following characteristics: intrinsic viscosity (): greater than 1 dl/g; % (r) - % (m) > 0, where % (r) is the percentage of the syndiotactic dyads and % (m) is the , percentage of the isotactic dyads; less than 2 % of the CH2 groups are contained in the (CH2)n sequences where n 2; and Bernoulli index (B) = 1~0.2; said copolymer (C) having the following characteristics: the quantity of propylene in the copolymer …
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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 February 20, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.