Pipe fitting
CA 2106686 A1 · Owner: Smith, Trevor R. · Inventors: Smith, Trevor R.; Welfare, Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe coupling comprising a tubular spigot (1) for insertion into the end of a pipe (8) and a sleeve (7) for positioning over the end of the pipe (8) into which the spigot (1) has been inserted. The outer surface of the spigot (1) defines a series of circumferential ribs (4) separated by circumferential grooves (5). When the coupling is assembled the sleeve (7) traps the pipe end (8) against the spigot (1) such that the ribs (4) are pressed into the inner wall of the tube and material displaced by the ribs (4) is pressed into the grooves (5). The mean cross-sectional area of the space defined between the radially outer surface of the spigot (1) and the radially inner of the sleeve (7) …
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 March 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 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.