Surface light source device
CA 2216509 A1 · Owner: Yoneya, Dai · Inventors: Yamamoto, Koichi; Omori, Takayoshi; Yoneya, Dai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
As regards a surface light source device for use with back-light or the like of a transmissive display panel the, efficiency of the cooling structure for the device will be improved and dust and dirt will be prevented from adhering. The surface light source device has a housing a diffuser panel, a, reflective plate, lamps and an electric circuit portion. The, housing has a window portion located ahead a base portion, located behind and side portions forming a flat space by connecting the two. The diffuser panel is mounted to the window portion of the housing. The reflective plate is supported by the side portions and partitions the flat space into a closed space ahead and an open space …
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 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 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.