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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Universum Film AG
Original Assignee
Universum Film AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Universum Film AGfiledCriticalUniversum Film AG
Application grantedgrantedCritical
Publication of FR894495ApublicationCriticalpatent/FR894495A/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
FR894495D1941-03-081943-05-07Procédé d'enregistrement sonore par demi-ondes et variation d'intensité
ExpiredFR894495A
(fr)