Target light detection
CA 2220713 C · Owner: Cal Corporation · Inventors: Buttner, Gary J.; Norman, Rodney
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of determining the existence of a target light source comprising progressively receiving successive pixel intensity values row by row and column by column of a scanned array of a light detector comparing each pixel intensity value as it is received with upper and lower thresholds, declaring successive rows of pixels as dark, bright, edge or depending on whether each row of the intensity values above between and below the thresholds meets predetermined criteria, declaring a light source as detected in the event an array of pixels exceeding the lower threshold are completely surrounded by pixels which are of lower intensity than the lower threshold, and storing a signal indicating …
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 November 10, 1997 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2019.
- 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.