Non-interfering color viewing system using spectral multiplexing
CA 2094151 C · Owner: He Holdings, Inc. · Inventors: Sagan, Philip M.; Ansley, David A.; Ullah, Motiur R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A viewing system operative to provide, non-interfering color displays to two or more viewers disposed within a catadioptric projection display system. The non-interfering viewing system includes a projector subsystem 10 for generating a first image with radiant energy from a first set of color wavelengths and for generating a second image with radiant energy from a second set of color wavelengths. The first and second sets of wavelengths are spectrally multiplexed so as to include first and second red, blue and green wavelengths respectively. A visor 32 is worn by a first viewer and includes a first triple notch filter. The first triple notch filter is adapted to transmit radiant energy of …
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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 July 31, 1992 and granted July 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.