An electro-optical detection system for reflection free underwater images from aircraft
CA 2113095 C · Owner: Qinetiq Limited · Inventors: Sutton, Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An etectro-optical detection system for detecting objects (12) embedded within a partially transmitting medium comprises means (20) to receive electromagnetic radiation in two close spectral channels (28 212): a signal channel (212) where the wavelength and bandwith of the signal channel are optimised to correspond to the peak of transmission of the medium and a reference channel (28) where the wavelength and bandwidth are selected to correspond to a spectral region where attenuation in the medium is high. The signal and reference channels are then subtracted (213) so as to remove the effect of reflected radiation from the signal channel (212). The signal is processed digitally (218) to …
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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 9, 1992 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 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
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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.