Polyolefinic pipe having a chlorinated polyolefinic hollow core
CA 2493823 A1 · Owner: Backman, Arthur L. · Inventors: Backman, Arthur L.; Dalal, Girish T.; Auvil, Andrew L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layered pipe of arbitrary length and cross-section is produced by coextrusion of a lower polyolefin (C2-C4) outer body over the exterior surface of a tubular core of randomly, partially randomly or blocky chlorinated lower , polyolefin the core having a wall thickness, measured in the radial direction, in the range from about 0.025 mm to 5 mm. The tubular core is coextensive with essentially the entire length of the pipe. The tubular core comprises a major proportion by weight of the randomly chlorinated polyolefin (r-CPO), or, partially randomly chlorinated polyolefin (pr-CPO) or, a blocky , chlorinated polyolefin (b-CPO) any of which may be blended with a minor proportion by …
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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 July 11, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2025.
- 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.