Apparatus for measuring a distance between two running vehicles using light wave
CA 2085324 C · Owner: Seto, Takao · Inventors: Senoo, Yasushi; Tanabe, Toru; Kitamura, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To measure a distance between two running vehicle a, measurement signal is first generated by irradiating light beam toward an article to be measured and then receiving the reflected light beam from the article. An apparatus for determining the forgoing distance therebetween using light wave operates such that a reference signal and the measurement signal generated in that way are input a digital mix-down circuit composed of two-stage flip-flop circuits to determine a phase difference between the reference signal and the measurement. The apparatus includes as essential components a clock delay circuit for delaying the going-high edge of the measurement signal while the reference signal is …
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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 December 14, 1992 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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
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.