Apparatus and method of warning rear-end collision
CA 2085325 C · Owner: Ohmamyuda, Yukio · Inventors: Kimura, Shigeru; Iwasaki, Kazuhisa; Tanabe, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus of warning a possible rear-end collision of a vehicle having the apparatus against a preceding vehicle, including a computer a distance sensor, measuring a vehicle-to-vehicle distance to the preceding vehicle, a velocity sensor measuring the velocity of the present vehicle. The computer computes a relative velocity of the present and preceding vehicles from a differential of the vehicle-to-vehicle distance and then an anticipated rear-end collision time by a division of the vehicle-to-vehicle distance by the relative velocity. The computer corrects the anticipated rear-end collision time in response to an acceleration on the relative velocity. The computer produces a warning …
Read the whole patent
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 October 21, 1997. 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.