Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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App Et Films Sonores SA Franc
Original Assignee
App Et Films Sonores SA Franc
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Filing date
Publication date
Application filed by App Et Films Sonores SA FrancfiledCriticalApp Et Films Sonores SA Franc
Application grantedgrantedCritical
Publication of FR725855ApublicationCriticalpatent/FR725855A/fr
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR725855D1930-11-241931-11-06Perfectionnements apportés aux dispositifs pour l'enregistrement des sons sur les films sonores
ExpiredFR725855A
(fr)