Full-color zero-order suppressed diffraction optics diffusing screen/louver filter laminate
CA 1328752 C · Owner: Hughes Aircraft Company · Inventors: Smith, Ronald T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A full-color holographic screen laminate is disclosed, having a well-defined exit pupil off-axis viewing, capabilities, high and uniform gain and low backscatter, and in addition the capabilities of blocking the zeroorder beam and allowing full-color viewing. The laminate in one preferred form includes several layers including a, plano-convex focusing lens a directional diffraction, optics diffusing screen and a thin plane-parallel lami-, nate consisting of a plano-concave cylindrical lens a, slanted louver filter, and a plano-convex cylindrical lens. The lenses can be made out of contrast enhancement material. The louver filter is curved so that the louvers are oriented parallel to 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
- Granted April 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2011.
- 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.