Method and apparatus for the spectrophotometric assay of aqueous liquids
CA 2109568 C · Owner: Asselain, Marc · Inventors: Manifacier, Daniel; Agnet, Yves; Asselain, Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The apparatus comprises a pump (1) to draw liquid (5) a filter (3) with two outlets (8 and 9): outlet (8) is for bleeding and outlet (9) is for filling the cell (1 2). Interferometry measurements are made at a temperature from 35 degrees to 50 degrees C (fluctuation 0.2 degrees C) and at a maximum relative humidity of 0.2%. Absorption curves a(f) are determined in reference to the matrix and standard equations are used to calculate the concentrations of components to be added.
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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 June 9, 1992 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2014.
- 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.