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Expired Canadian patentCanada

Method and apparatus for measuring cyanide

CA 1302211 C · Owner: Kelada, Nabih P. · Inventors: Kelada, Nabih P.; Lue-Hing, Cecil

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Abstract From the Canadian patent

Method And Apparatus For Measuring Cyanide Abstract, A system for measuring cyanides in a sample employs a photoillumination component for producing ultraviolet radiation to dissociate cyanides contained in an alkaline sample. The system includes filtering components interposed between the photoillumination components and an alkaline sample to be tested for passing lower frequency ultraviolet radiation to produce an irradiated sample in which cyanides have been dissociated, while blocking high frequency ultraviolet radiation to inhibit thioscyanate dissociation. Thin-film distillation components are included for separating cyanide from the irradiated sample to produce recovered cyanide for …

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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

  • Granted June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 28, 1987
GrantedJune 2, 1992
Term endedJune 2, 2009
Patent numberCA 1302211 C
Classification (IPC)G01N21/25 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedSep 28, 1987Patent grantedJune 2, 1992Term endedJune 2, 2009

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.