Non-invasive substance concentration measurement using an optical bridge
CA 2485964 C · Owner: Vivascan Corporation · Inventors: Harjunmaa, Hannu; Kun, Stevan; Rolls, John A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for non-invasively measuring a concentration of a target analyte dissolved in a fluid flowing through a sample (80) is presented. It includes directing a probe beam (202) of electromagnetic radiation consisting , of time multiplexed components of different wavelengths (.lambda.P .lambda.R), through the sample and measuring the difference of the absorption of the radiation at least one wavelength pair at different sample states. During sample state changes, the amount of fluid containing the target analyte within the sample is changing, which varies the total amount of target analyte in the sample, as well as the absorption properties of the sample. The sample …
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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 April 24, 2003 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 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
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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.