Projected image alignment method and apparatus
CA 2018520 C · Owner: Kwan, Simon Chi Yeun · Inventors: Shaw, William C.; Kwan, Simon Chi Yeun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Projected image misalignment in a 3-D motion picture projector is corrected by shifting one of the projection lenses in accordance with a predetermined program during presentation of the motion picture. In one embodiment manually initiated control signals for adjusting the lens shift are recorded in a memory and can be subsequently retrieved for automatically controlling lens shift. In another embodiment, lens shift is controlled by reading predetermined witness marks on the film.
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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 June 7, 1990 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 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.