Sensor with improved drift stability
CA 2176006 A1 · Owner: Wood, Kenneth B. · Inventors: Wood, Kenneth B.; Bentsen, James G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an optical fluorescence based sensor for measuring the concentration of a gas (e.g. CO2 or ammonia) in a medium such as blood which has improved drift stability. In a preferred embodiment the , sensors of the present invention comprise microcompartments of an aqueous phase having a pH sensitive sensing component within a hydrophobic barrier phase. The sensors of the present invention are substantially free of partitioning species other than the analyte of interest which can migrate from one phase to the other in response to a change in pH in the aqueous phase and which substantially affect the concentration dependent signal. In an alternative …
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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 October 25, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 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.