Television with apertures to modulate beam intensity
CA 2072142 C · Owner: Aura Systems, Inc. · Inventors: Um, Gregory; Szilagyi, Andrei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A television display apparatus (10) wherein a white light source (12) emits a beam onto a plurality of dichroic mirrors (14) which split the beam into three beams of the primary colors then reflects the three primary beams onto three deformable reflective surfaces (44), which again reflect the beams through slits (36) in a non-reflective surface (34) thereby modulating the intensity, of the beams. The amount of light passing through the slits (36) is horizontally scanned by one surface of a rotating polygonal mirror (54), then passes through collimating and projection lenses (24 26) and onto a screen.
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 October 29, 1990 and granted July 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2012.
- 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.