Continuous on-line measurement of fluid or slurry viscosity
CA 2077908 C · Owner: Cowper, Norman Terry · Inventors: Cowper, Norman Terry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rheometer or viscometer for continuously measuring the rheological properties of non-Newtonian mixed phase fluids or slurries. The device has a vertically disposed inverted U-tube to maintain solids in, suspension and therefore, exhibit a homogeneous character. The fluid flow rate is controlled to assure nonturbulent laminar flow through the tube. Pressure is measured at a point in each leg of the U-tube and compared. For a constant flow rate, the pressure drop over the tube is used to measure the viscosity of the fluid in the tube.
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 March 18, 1991 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2013.
- 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.