Apparatus for examining gaze shift in depth direction
CA 2090358 C · Owner: Murakami, Shinji · Inventors: Murakami, Shinji; Murakami, Shinji; Fujii, Mitsuru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an apparatus for examining gaze shift in depth direction, light emitting diodes B and E or D and C are, lit at a plurality of positions with different distance in depth direction from the subject, and eye movement of the subject at that time is detected by an eye movement detecting portion (2). The signal of detection is processed in a signal processing circuit (5) and is applied to a calculating portion (1). The calculating portion (1) determines whether or not there is a disorder in gaze shift in depth direction of the subject by using any or all of latency in eye movement, time constant amplitude, change in convergence angle number of, occurrence of saccade, and asymmetry of left and …
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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 February 25, 1993 and granted April 15, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2015.
- 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.