Light tube system for distributing sunlight or artificial light singly or in combination
CA 2395010 A1 · Owner: Eisenman, James A. · Inventors: Johanson, Walter A.; Eisenman, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hybrid lighting systems use light distributor tubes to distribute artificial light, and natural sunlight through the same distributor tubes. Devices for gathering uncollimated, light from conventional sources (such as electrically energized arcs or filaments housed, in evacuated or gas filled glass envelopes) and directing the light into the ends of tubes, designed to distribute such light. Devices for gathering and concentrating inherently, collimated sunlight to be fed into the same light distributing tubes used by the artificial light. One preferred embodiment comprises a light gathering and concentrating system in the, form of a pair of opposed parabolic reflectors one which is …
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 July 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2024.
- 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.