Optical distance measuring apparatus and apparatus for mounting the same
CA 2061848 C · Owner: Seto, Takao · Inventors: Omamyuda, Yukio; Seto, Takao; Tanabe, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical distance measuring apparatus operable in accordance with an optical intensity modulating process to optically measure a distance between a driver's vehicle and a vehicle running ahead of his vehicle is disclosed. The apparatus includes as essential components a light emitting portion serving as a light source to emit a distance measuring light beam, an optical lens system, a light receiving portion for receiving a reflected light reflected from the vehicle running ahead of his vehicle through the optical lens system, and a processing system for correcting phase delay between the distance measuring light beam and the reflected light beam utilizing reference light beams emitted …
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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 27, 1992 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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.