Transmission screen and projection display
CA 2459939 A1 · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Teramoto, Kohei; Miyata, Akihisa; Suzuki, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transmission screen comprising a refraction total-reflection Fresnel lens plate (10C), a stray light removing plate (20) composed of a condenser lens array (21) in which unit lenses are arrayed in a periodic structure in the vertical direction on an incident surface of a transmissive substrate (22) and a black stripe (23) in which transparent parts (201) each disposed in the vicinity of a focal point of each unit lens and an opaque parts (200) each disposed in the vicinity of the focal point of each unit lens are alternately arrayed in a periodic structure in the vertical direction on an output surface of the transmissive substrate (22), and an image formation display plate (30) …
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 May 28, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2024.
- 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.