Method and apparatus for illumination of a liquid droplet fountain to produce rainbows
CA 2069108 C · Owner: Golovin, Ripley · Inventors: Golovin, Ripley; Fraser, Alistair
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for producing primary rainbows (4) and secondary rainbows (4) in a curtain of liquid droplets (1) in the air, whereby the rainbows (4) are produced by refractive dispersion within the droplets themselves, and whereby the rainbows (4) are visible from directly opposite sides of the curtain of droplets (1). The curtain of liquid droplets (1) is produced by a water fountain. The device of the invention comprises a source of liquid droplets (5). The light source can be an array of lights (11) configured so that the light rays (12) appear to emanate from a common center (13). The light source may also be a collimated light source (7) such as a searchlight which reflects …
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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 21, 1990 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.