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.)
Expired
Application number
GB27737/34A
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British Thomson Houston Co Ltd
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British Thomson Houston Co Ltd
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Application filed by British Thomson Houston Co LtdfiledCriticalBritish Thomson Houston Co Ltd
Publication of GB439710ApublicationCriticalpatent/GB439710A/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
G11B5/62—Record carriers characterised by the selection of the material
G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
G11B5/708—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by addition of non-magnetic particles to the layer
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Compositions Of Macromolecular Compounds
(AREA)
Abstract
Discs or cylinders on which sound may be magnetically recorded are made by a moulding or like process from a composition consisting of a magnetizable powder (preferably iron derived from iron carbonyl) mixed with particles of a non-magnetic material such as styrol, with the addition of a suitable further filling material if desired.
GB27737/34A1933-09-291934-09-27Improvements in and relating to methods of recording acoustic vibrations
ExpiredGB439710A
(en)
Procedure for the obtaining of permanent magnets anisotropos, exempt from ferro-magnetic materials. (Machine-translation by Google Translate, not legally binding)