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CA 2266441 A1 · Owner: Lennerstad, Hakan · Inventors: Lennerstad, Hakan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When passing a sign the image to be reproduced by the sign can only be reproduced correctly in one position during passage whereas in other , positions the image will be distorted. The present invention solves this problem of distortion so that correct images are shown in every position. According to the invention the sign has two layers where one layer in front of a light source is provided with perforations to allow light through and a second layer is placed in front of the first layer the second layer , containing one or more images which are mirror-inverted and compressed from both sides.
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 September 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 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.