Improvements in side-scattering light guides
CA 2501130 A1 · Owner: Poly Optics Australia Pty Ltd. · Inventors: Smith, Geoffrey Burton; Joseph, Edmond Kenneth; Franklin, James Bruce
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to side-scattering light guides that generally comprise a core of transparent optically homogenous material seeded with diffuser particles. The light guide also comprises an optically transmitting sheath having a lower refractive index than the core surrounding and in contact with , the sides of the core to prevent any light being transmitted along the core from escaping through the core's sides. In general the diffuser particles , impart only a small deviation to light rays incident upon them and are , distributed to scatter light being transmitted along the core so that at least some of the scattered light exits the sides of the core. A diffusing jacket is …
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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 September 8, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 8, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2025.
- 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.