Planetarium apparatus and image projecting apparatus
CA 2605338 C · Owner: Ohira, Takayuki · Inventors: Ohira, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Light emitted from a light source passes through a stellar base plate a fixed , aperture, and a wide-angled projection lens via a condenser lens and projects a , starry sky on a screen. The stellar base plate is a light-shielding disk having a , number of through holes which correspond to positions and brightness of actual stars, is supported by an inner ring of a ball bearing having the center at a position , corresponding to the axis of rotation so as to be capable of rotating about the axis , of rotation, and is driven by a motor via a belt. The centers of the projection lens, a window of the fixed aperture the condenser lens, and the light source are all , arranged on the optical …
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 April 27, 2006 and granted May 7, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.