Dry analytical element for acetaminophen assay
CA 2099639 C · Owner: Arter, Thomas C. · Inventors: Arter, Thomas C.; Mauck, John C.; Schaeffer, James R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spectrophotometric assay for the detection of acetaminophen in aqueous fluids can be carried out with a dry analytical element. The element comprises a support having thereon one or more reagent layers containing a first enzyme, aryl acylamidase to cleave, the amide bond of acetaminophen to produce p-aminophenol; a second enzyme, ascorbic acid oxidase to, oxidize the p-aminophenol so that it couples to a water soluble coupling agent to form a dye that is read at 670nm. The assay is precise, accurate on serum and plasma samples, and relatively free from significant interferences. The element also allows measurement over a broad dynamic range.
Read the whole patent
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 24, 1993 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2015.
- 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.