Marking of pipe joints
CA 2493775 C · Owner: Shell Canada Limited · Inventors: Zijsling, Djurre Hans; Dimitriadis, Klisthenis; Den Boer, Johannis Josephus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method of permanantly marking the location of a tubular joint comprises creating a cavity (3) into the end surface of one of the tubular ends that are to be joined by a forge weld or screw thread connection inserting a marker (4) into said cavity (3) and subsequently joining the tubular ends together.
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 November 19, 2013. 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.