Carbon black-containing crosslinked polyethylene pipe having resistance to chlorine and hypochlorous acid
CA 2493900 C · Owner: Viega Llc · Inventors: Mahabir, Carl M.; Backman, Arthur L.; Dalal, Girish T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pipe or tubing of crosslinked polyethylene ("PEX") containing less than 2% by wt. carbon black provides improved , resistance to oxidizing agents such as chlorine and hypochlorous acid in water. The pipe may be further protected with a thin tubular core (inner layer) of high density polyethylene or chlorinated polyethylene. The pipe may optionally have an oxygen barrier layer such as poly(ethylene-co-vinyl alcohol) ("EVOH") contiguously disposed , radially outward from the carbon-containing PEX layer. The pipe is suitable for potable water applications and for hot water radiant heating systems.
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 July 16, 2003 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.