Controlled pressure drop filter
CA 2443583 C · Owner: Wittrisch, Christian · Inventors: Wittrisch, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a strainer device with controlled pressure drop including a filtering element (9) delimited and centred on a base pipe (1) by spacers which are longitudinal relative to the axis of the pipe and arranged on the diameter of the pipe so as to divide the annular space defined by the filtering element and the pipe into sectors delimited by the spacers, and in which collection pipes (5) are arranged and emerge through one end in the sectors. The invention is applicable to tubular drainage or injection strings in a geological formation for example, a hydrocarbon deposit.
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 October 7, 2003 and granted July 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 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.