Determination of anionic species concentration by near infrared spectroscopy
CA 2220913 C · Owner: Fpinnovations · Inventors: Leclerc, Denys F.; Trung, Thanh P.; Kester, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A method for determining the concentration of anionic species selected from the, group consisting of OH-, CO3= and HS- and of organic species in an aqueous sample, solution, said method comprising subjecting said solution to near infrared radiation at a, wavelength region of wave numbers selected from 4,000 to 14,000 cm-1 through a solution path length of at least 3 mm to obtain spectral data for said solution; obtaining, comparative spectral data for said anionic species at known concentrations in aqueous, solutions; and correlating by multivariate calibration the relationships between said, spectral data of said sample solution and said comparative spectral data to determine said, …
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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 November 12, 1997 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2019.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.