Method and apparatus for writing information on processed photographic film
CA 1282170 C · Owner: Guez, Moshe · Inventors: Guez, Moshe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides for a system and a method for applying a sound track to cinematic film by means of a modulated laser beam. The method of writing sound track information on processed cinematic film having an emulsion layer on a substrate comprises the following steps. First a, laser is directed to apply to the emulsion a light beam of sufficient frequency, intensity area and, duration in order to vaporize at least a portion of the emulsion without damaging the substrate. Second the light beam is passed through a mask which has a variable area for light transmission. Finally the, light transmission area of the mask is varied by means of an audio-frequency electric signal to …
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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
- Granted March 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 26, 2008.
- 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.