Tunnel
CA 1051676 A · Owner: Montreal Engineering Company Limited · Inventors: Owen, John A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making a connection to protect a shore approach section of an underwater pipeline comprises drilling a hole downwardly through the sea bed, introducing a sealed pipe riser which may, or may not, have an, elbow welded to the upper end thereof into the hole; grouting the inserted, pipe riser in the hole and connecting a tunnel section to the shore with the pipe riser. A pipe is passed through the tunnel and joined to the pipe riser. The tunnel pipe may be connected to the pipe riser after the drilling of the hole by the completion of the tunnel to intersect the pipe riser or, in the alternative, the tunnel section may be completed first and have the leading end thereof sealed off …
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
- Granted April 3, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 1996.
- 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.