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Expired Canadian patentCanada

An electro-optical detection system

CA 1340975 C · Owner: Qinetiq Limited · Inventors: Sutton, Philip

CIPO record

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Abstract From the Canadian patent

Visual detection of objects submerged in water e.g. mines, is difficult because of reflection of light from particulate matters etc. within the water as well as from the surface of the water. Polarization processing is not very effective at removing sea surface glare. The present invention provides an electro-optical detection system capable of improved detection of submerged objects. The system comprises a device to receive electro-magnetic radiation, apparatus for separating the received radiation into two spectral channels detectors, responsive to electro-magnetic radiation and located to receive radiation in the respective channels, and a signal processor connected to the output of the …

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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 April 25, 2000. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2017.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 11, 1989
GrantedApril 25, 2000
Term endedApril 25, 2017
Patent numberCA 1340975 C
Classification (IPC)G01S17/06 +2 more

Timeline

Timeline From CIPO dates

1990199319961999200220052008201120142017Application filedMay 11, 1989Patent grantedApril 25, 2000Term endedApril 25, 2017

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