Blends of different conjugated diene/monovinyl aromatic copolymers in bituminous based roofing and waterproofing membranes
CA 1105643 A · Owner: Phillips Petroleum Company · Inventors: Bresson, Clarence R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
27313, Abstract of Disclosure, A radial conjugated diene/monovinyl aromatic copolymer having a weight average molecular weight (Mw) above 200,000 and a conjugated diene/monovinyl aromatic ratio of 50/50 to 85/15 is used together with a conjugated diene/monovinyl aromatic copolymer having an Mw below 200,000 and being radial or linear, with same conjugated diene/monovinyl aromatic weight ratios as earlier given, in an asphalt-containing composition to yield desirable high as well as low temperature properties.
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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
- Granted July 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 1998.
- 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.