Soap film scope
CA 2117541 A1 · Owner: Richard, Charles G. · Inventors: Richard, Charles G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an optical device for viewing colors on a soap film. These colors are a phenomenon known a light interference. The device has a slide which is displaced into and out of a reservoir of liquid soap by a manual lever. The slide has a circular hole which is where the film becomes suspended. When the slide is posed in a viewing position above the reservoir it becomes illuminated by a mirror which reflects a light source onto the film thereby, producing fascinating color and light effects. The image is magnified by a lens prior to reaching the observers eye. The device also has a system for disturbing the soap film in order to produce further color and light …
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 August 23, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2016.
- 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.