Opaque projector
CA 2014370 C · Owner: Plus Corporation · Inventors: Koga, Ritsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed. There is a projecting mirror for reflecting light reflected by the object to be projected and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane. The opaque projector has a mechanism capable of changing the angle of the stage on which the object to be projected can be placed in such a manner that the object to be projected, the optical axis of the projecting lens and the projection plane meet a Scheimpflug condition. 11
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 12, 1990 and granted November 2, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 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
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.