Laser projection apparatus with light valve and scanning reading beam
CA 2372833 C · Owner: Troyer, Diane · Inventors: Troyer, Diane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser projection system wherein speckle is suppressed through beam-path displacement, by deflecting the beam during projection thereby avoiding both , absorption and diffusion of the beam while preserving pseudocollimation (noncrossing rays). Path displacement is achieved by scanning the beam on liquid crystal light valves (LCLV's) (30) which also provide enhancements - , in energy efficiency brightness, contrast, beam uniformity (by suppressing both laser-mode ripple and artifacts). Preferably deflection is performed by a mirror (20) mounted on a galvanometer or motor (21) for oscillation; images are written incrementally on successive portions of an LCLV control stage while the …
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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 April 30, 1999 and granted January 15, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2021.
- 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.