A system and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator
CA 2295484 C · Owner: Formosa, Joseph S. · Inventors: Formosa, Joseph S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A system and method for determining which of a plurality of visually indistinguishable objects (14) have been marked with a covert indicator (10) in which a portion of a surface (12) of each of a first type of objects (14) are provided with a covert holographic indicator (10) which is exposed to be viewed but which is detectable only when illuminated with a coherent reference light of predetermined wavelength. The surfaces (12) of objects (14) are scanned with a coherent reference light with the predetermined wavelength and , evaluated to determine whether the scanned surfaces include the covert holographic indicator (10). The presence of the covert holographic indicator (10) …
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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 July 7, 1998 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2020.
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