Apparatus for testing a shear thickening plugging fluid
CA 2173350 C · Owner: Johnsen, Hans Konrad · Inventors: Johnsen, Hans Konrad; Sunde, Egil; Engan, Tommy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for testing a shear thickening plugging fluid comprising a cylinder (1) having an inlet (2) with an inlet valve (3) for plugging fluid and an outlet (4) with an outlet valve (5) for plugging fluid a moveable piston (6) sealing against the cylinder walls so that, the piston by being moved in the cylinder can suck plugging fluid into the cylinder through the inlet (2) and in a retrograde movement can, press the plugging fluid out through the outlet (4) a shear valve (7) connected with the outlet (4) which shear valve (7) is adjustable for adjusting a desired shear stress, a means (8 9) for measuring the pressure drop over the shear valve a means (10) for collecting plugging, …
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 11, 1994 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2016.
- 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.