Light intensity equalizing element for lighted display panel
CA 2246440 C · Owner: Wendel, Christopher M. · Inventors: Wendel, Christopher M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An intensity equalizing element for placement between a number of individual fluorescent tubes (20) in a light panel (30) and the panel image display surface (16). The element includes a like number of curved surfaces (36) in axial alignment with the individual tubes to reduce variation in observed intensity due to tube spacing. Each curved surface is provided with a nonuniform opaque dot pattern thereon to reduce variation in the intensity of light at the panel display surface and enhance uniformity of light intensity throughout an overlying image display.
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 February 7, 1997 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.