A high contrast front projection display panel and a method of making a high contrast front projection display panel
CA 2432781 A1 · Owner: Veligdan, James T. · Inventors: Veligdan, James T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical display panel (10) which provides improved viewing contrast for front projection applications, and a method of producing a stacked optical waveguide panel for front projection applications are disclosed. The optical , pannel includes a plurality of stacked optical waveguides (16a) wherein each , waveguide has a back face and an outlet face at opposing ends of each waveguide, and wherein each waveguide is formed of a core (26) between an opposing pair of cladding layers (28), and at least one reflector connected to the back face of at least one waveguide wherein the at least one reflector , (19) receives image light incident through at least one waveguide from the outlet …
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 December 14, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2023.
- 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.