Method for production of electric signs and an electric sign
CA 2520729 C · Owner: Karlsson, Dennis · Inventors: Karlsson, Dennis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing, by a laser that scans the rear side of a transparent object, figures and text that are recessed in the transparent material and that as seen from the outside (5) appear as a raised relief (1) and for which the effect of depth (d, d') depends on the amplitude of a signal superposed the input, frequency-controlled laser power by which the screen pattern is obtained. By an optimal fineness of scanning relative the material of the sign, the figures may obtain a very strong luminescence even at a very low input edge-illumination power. Furthermore the invention relates to an edge-, illuminated electric sign (L1 L2) with a figure produced by the manufacturing …
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 April 5, 2004 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2026.
- 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.