Pipe joint and process for producing pipe joints made of polyolefin
CA 2116561 A1 · Owner: Wirsbo Rohrproduktion Und Vertriebs-Gmbh · Inventors: Imgram, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An end (13) of a pipe (12) made of polyolefin is cold-deformed i.e. at the ambient temperature, by means of a spreading mandrel. After the spreading mandrel is removed the enlarged pipe end, (13) and a desired connecting piece or the end (11) of another pipe (10) are plugged onto each other. The polyolefin pipe end (13) is then deformed back to the original shape and forms by self-redeformation a solid and gas-tight connection with the connecting piece or the end (11) of the other pipe (10).
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 August 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2014.
- 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.