Shroud for a well screen
CA 2227458 C · Owner: Mcconnell, Howard T. · Inventors: Whitworth, Robert D.; Mcconnell, Howard T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shroud for covering a well screen comprising a tubular member having circular holes in its wall through which well fluid can flow into the annulus between the shroud and the screen, a plurality of arcuate straps located in the annulus with each strap having a width less than the diameter of the holes with the ends of each strap attached to the shroud on opposite sides of a hole in the shround and extending into the annulus between the shroud and the screen to cause the well fluid flowing through the holes to swivel as it passes through the holes and flows laterally from each side of the straps into the annulus between the shroud and the screen.
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 January 20, 1998 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2020.
- 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.