Cinematographic optical system
CA 2059822 A1 · Owner: Ashbey, James A. · Inventors: Ashbey, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
No Figure), ABSTRACT, CINEMATOGRAPHIC OPTICAL SYSTEM A method and apparatus for providing high definition cinema pictures involves the use of a plurality of filters each, capable of transmitting light in a different wavelength band to, form a plurality of superimposed image components on the cinema film during a single frame period. A similar filtering operation is carried out when the film is projected to reconstitute the original colour image. Thus if two filters, are used at each stage twice the normal frame rate can be achieved whilst still using a camera and projector operating at the normal rate.
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 January 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2014.
- 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.