Enzymatic assay for carbon dioxide
CA 2036057 A1 · Owner: Norton, Gary E. · Inventors: Nealon, Daniel A.; Daggett, Stephen G.; Nealon, Daniel A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A method for the assay of carbon dioxide in body fluids is disclosed. The method involves: a) mixing, at a pH in the range of 6.0 to 8.5 a measured amount of said body fluid with excess amounts of phosphoenolpyruvate; malate dehydrogenase; from 0.2 to 1.5 mmol/L of reduced nicotinamide adenine dinucleotide; from 0.5 to 300 U/L phosphoenolpyruvate carboxykinase; from 0.1 to 10.0 mmol/L of each of the cofactors magnesium and manganese ions; and from 0.1 to 10 mmol/L of a sulfhydryl agent and, b) spectrophotometrically measuring the change in the concentration of the reduced form of nicotinamide adenine dinucleotide in the mixture at a substantially constant …
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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 February 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 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.