Method of monitoring and controlling yield stress
CA 2209104 A1 · Owner: Dow Corning Corporation · Inventors: Deleeuw, David Charles; Langley, Neal Roger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The yield stress of rheologically plastic fluids such as coatings sealants, and personal care lotions, determines their tendency to flow at low gravitational stress. Yield Stress is the apparent threshold stress above which flow is observed on an arbitrary time scale. An on-line technique to monitor yield stress during processing was developed herein and is used in controlling the slump or non-slump behavior of such products. A residual stress after a flow, excursion returns to zero shear rate is related to yield stress. This residual stress is used for process monitoring. It is measured from the residual pressureor torque after a controlled strain rheometer reaches zero strain rate.
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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 June 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2019.
- 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.