Downhole data communication
CA 2755402 C · Owner: Expro North Sea Limited · Inventors: Hudson, Steven Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of downhole data communication in a well in which there is a flow of product from the formation towards the surface the data communication taking place between two locations in the flow path at least one of which is downhole in the well and the method comprising the steps of controlling a flow rate of the product at a first of the two locations in dependence on data to be transmitted; detecting at the second of the two locations, the effect of said controlling of the flow rate of the product at the first location; using the results of the detecting step to extract the data transmitted; and keeping the nominal flow rate at the first location at a state for at least a minimum period …
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 2, 2004 and granted April 23, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 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.