Ndir apparatus and method for measuring isotopic ratios in gaseous samples
CA 2256729 A1 · Owner: Eckstrom, Donald J. · Inventors: Eckstrom, Donald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an apparatus and method for measuring isotopic ratios in gaseous samples by NDIR spectroscopy. The apparatus and method provide four separate optical paths for separate measurement of each of two isotopes relative to a reference signal, using spectrally resolved infrared radiation. The design permits the measurements to be made accurately without significant time lags between measurements, and without interchanging of cells or filters.
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 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2019.
- 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.