Pump plug
CA 2521763 C · Owner: Shell Canada Limited · Inventors: Lohbeck, Wilhelmus Christianus Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pump plug (1) for flowline operations, which pump plug (1) comprises a resilient body (2) and a flexible cage (3) having a wear-resistant outer surface (4) arranged around the resilient body (2) wherein the flexible cage , (3) comprises a tube having a first end (6) and a second end (7) which tube , is provided with a number of slits closed (16) at at least one end.
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 April 13, 2004 and granted August 14, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 2026.
- 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.