Secondary containment flexible underground piping system
CA 2109730 C · Owner: Leblanc, Leo J. · Inventors: Leblanc, Leo J.; Youngs, Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The secondarily contained piping system having two spaced access chambers (20) that are interconnected by a secondary containment pipe (24) to provide a sealed arrangement for flexible fluid supply pipe (40), the ends of which are disposed within the access chambers. The outer flexible pipe (42) is sized to permit the insertion and/or removal of the primary flexible pipe (40) during installation and testing of the same and after backfilling of the trench within which the pipe is disposed the outer flexible, tubing partially collapses to engage and prevent relative movement between the two pipes while providing a flow path thereinbetween.
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 25, 1993 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2015.
- 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.