Reagent and methods for calcium determination
CA 2071206 A1 · Owner: Synermed, Inc. · Inventors: Denney, Jerry W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A single, stable reagent and automatable methods utilizing the reagent for the assay of calcium in serum and aqueous samples, such as urine. (Aqueous samples contain little or no protein.) The reagent includes arsenazo III, 8-hydroxyquinoline, a buffer that does not bind calcium competitively with arsenazo III and that provides a reagent pH from about 8 . 5 to about 10 the, buffer being in sufficient amount to maintain pH within +/-0.1 pH units of the reagent pH when the regent is added to a sample of unknown calcium content dimethyl-, sulfoxide and water. Importantly dimethylsulfoxide, permits the incorporation of 8-hydroxyquinoline into a single, stable reagent, which is at an alkaline pH …
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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 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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.