GB466023A - Improvements in the manufacture and production of sound record carriers - Google Patents

Improvements in the manufacture and production of sound record carriers

Info

Publication number
GB466023A
GB466023A GB3189535A GB3189535A GB466023A GB 466023 A GB466023 A GB 466023A GB 3189535 A GB3189535 A GB 3189535A GB 3189535 A GB3189535 A GB 3189535A GB 466023 A GB466023 A GB 466023A
Authority
GB
United Kingdom
Prior art keywords
magnetic
film
sound
fe2o3
decomposition
Prior art date
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
GB3189535A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to GB3189535A priority Critical patent/GB466023A/en
Publication of GB466023A publication Critical patent/GB466023A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • 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
    • G11B5/706—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 the composition of the magnetic material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • 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
    • G11B5/706—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 the composition of the magnetic material
    • G11B5/70626—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 the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—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 the composition of the magnetic material containing non-metallic substances iron oxides

Landscapes

  • Paints Or Removers (AREA)

Abstract

A sound-record carrier for the electro-magnetic recording and reproduction of sound by magnetic action on magnetizable bodies, according to the known process suggested by Poulsen, consists of a powdery magnetic metal oxide in a finely divided state on or in a non-magnetic carrier material. The oxides Fe3O4 and g --Fe2O3 are especially suitable, and may be prepared by the decomposition of complex metal salts, for example iron-ammonium salts, or complex organic metal compounds such as pyridine compounds. The decomposition may be carried out in the non-magnetic carrier material before or after the casting of the mass into a film. In one example, colloidal g --Fe2O3.H2O is precipitated by blowing air into an aqueous solution of tetrapyridine ferrous chloride, decanted, filtered, heated to 150 DEG C., in a current of dry air, made into a paste with a solution of acetyl cellulose in acetone, and the emulsion applied to a film of acetyl cellulose by means of a film-casting machine. Four other examples are described.
GB3189535A 1935-11-18 1935-11-18 Improvements in the manufacture and production of sound record carriers Expired GB466023A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3189535A GB466023A (en) 1935-11-18 1935-11-18 Improvements in the manufacture and production of sound record carriers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3189535A GB466023A (en) 1935-11-18 1935-11-18 Improvements in the manufacture and production of sound record carriers

Publications (1)

Publication Number Publication Date
GB466023A true GB466023A (en) 1937-05-18

Family

ID=10329994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3189535A Expired GB466023A (en) 1935-11-18 1935-11-18 Improvements in the manufacture and production of sound record carriers

Country Status (1)

Country Link
GB (1) GB466023A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525601A (en) * 1947-04-16 1950-10-10 Indiana Steel Products Co Magnetic impulse record member
US2558302A (en) * 1947-08-07 1951-06-26 American Cyanamid Co Powdered transparent iron oxide pigments
US2582590A (en) * 1946-08-15 1952-01-15 Armour Res Found Method of making magnetic material
US2594893A (en) * 1945-01-09 1952-04-29 Gen Electric Magnetic recording medium
US2607710A (en) * 1949-04-02 1952-08-19 Minnesota Mining & Mfg Abrasion-resistant magnetic recording tape
US2607699A (en) * 1948-08-26 1952-08-19 Audio Devices Inc Instantaneous recording phonographic disks
US2628929A (en) * 1949-07-15 1953-02-17 Minnesota Mining & Mfg Method and apparatus for transferring a magnetic sound track to movie film
US2631855A (en) * 1947-09-27 1953-03-17 Brush Dev Co Magnetic recording and reproducing
US2633431A (en) * 1947-12-20 1953-03-31 Shellmar Products Corp Magnetic recording tape and method of making same
US2654681A (en) * 1950-01-27 1953-10-06 Minnesota Mining & Mfg Magnetic recording tape
US2686676A (en) * 1949-04-08 1954-08-17 Dictaphone Corp Recording progress indicator for magnetic records
US2689168A (en) * 1948-11-24 1954-09-14 Gen Electric Co Ltd Production of gamma ferric oxide
US2689167A (en) * 1948-08-06 1954-09-14 Gen Electric Co Ltd Production of gamma ferric oxide
US2694656A (en) * 1947-07-25 1954-11-16 Armour Res Found Magnetic impulse record member, magnetic material, and method of making magnetic material
US2699408A (en) * 1950-03-24 1955-01-11 Armour Res Found Magnetic record member
US2744031A (en) * 1949-10-15 1956-05-01 Ncr Co Sheet having a transferable coating containing magnetizable material
US2751313A (en) * 1950-12-21 1956-06-19 Audio Devices Inc Production of magnetic sound tape
US2909118A (en) * 1956-01-05 1959-10-20 Warren S D Co Magnetically imageable planographic plate

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594893A (en) * 1945-01-09 1952-04-29 Gen Electric Magnetic recording medium
US2582590A (en) * 1946-08-15 1952-01-15 Armour Res Found Method of making magnetic material
US2525601A (en) * 1947-04-16 1950-10-10 Indiana Steel Products Co Magnetic impulse record member
US2694656A (en) * 1947-07-25 1954-11-16 Armour Res Found Magnetic impulse record member, magnetic material, and method of making magnetic material
US2558302A (en) * 1947-08-07 1951-06-26 American Cyanamid Co Powdered transparent iron oxide pigments
US2631855A (en) * 1947-09-27 1953-03-17 Brush Dev Co Magnetic recording and reproducing
US2633431A (en) * 1947-12-20 1953-03-31 Shellmar Products Corp Magnetic recording tape and method of making same
US2689167A (en) * 1948-08-06 1954-09-14 Gen Electric Co Ltd Production of gamma ferric oxide
US2607699A (en) * 1948-08-26 1952-08-19 Audio Devices Inc Instantaneous recording phonographic disks
US2689168A (en) * 1948-11-24 1954-09-14 Gen Electric Co Ltd Production of gamma ferric oxide
US2607710A (en) * 1949-04-02 1952-08-19 Minnesota Mining & Mfg Abrasion-resistant magnetic recording tape
US2686676A (en) * 1949-04-08 1954-08-17 Dictaphone Corp Recording progress indicator for magnetic records
US2628929A (en) * 1949-07-15 1953-02-17 Minnesota Mining & Mfg Method and apparatus for transferring a magnetic sound track to movie film
US2744031A (en) * 1949-10-15 1956-05-01 Ncr Co Sheet having a transferable coating containing magnetizable material
US2654681A (en) * 1950-01-27 1953-10-06 Minnesota Mining & Mfg Magnetic recording tape
US2699408A (en) * 1950-03-24 1955-01-11 Armour Res Found Magnetic record member
US2751313A (en) * 1950-12-21 1956-06-19 Audio Devices Inc Production of magnetic sound tape
US2909118A (en) * 1956-01-05 1959-10-20 Warren S D Co Magnetically imageable planographic plate

Similar Documents

Publication Publication Date Title
GB466023A (en) Improvements in the manufacture and production of sound record carriers
BE792847A (en) PROCESS FOR PREPARING ACICULAR MAGNETIC IRON OXIDES
CA1019561A (en) Production of finely divided acicular magnetic iron oxides
GB1432643A (en) Manufacture of cobalt-modified ypsilon-iron-iii-oxides
FR1451260A (en) Magnetic recording process
GB963102A (en) Improvements relating to the duplication of magnetic recordings
GB1318579A (en) Methods of making acicular cobalt-modified ypsilon-fe2o3 powder
JPS52122213A (en) Production of ferromagnetic metal powder
AT343373B (en) MAGNETOGRAPH CARRIER FOR THE RECORDING OF MAGNETIC SIGNALS THAT CANNOT BE CHANGED UNNONIZED, AND A PROCESS FOR CREATING SUCH RECORDS
US2582590A (en) Method of making magnetic material
JPS5284722A (en) Thin film magnetic head and its production
GB1395704A (en) Magnetic materials
GB504932A (en) Improvements relating to the magnetic recording or reproducing of sound
GB594474A (en) Improvements in and relating to the production of magnestisable materials and to thefabrication of magnets therefrom
GB986473A (en) Manufacture of magnetic recording media
GB902838A (en) A process for the production of magnetic recording media
BE756143A (en) PROCESS FOR PREPARING IRON OXIDE, ACICULAR OR GOETHITE USED FOR THE PRODUCTION OF MAGNETIC IRON OXIDE FE2O3
US3115470A (en) Magnetic material, magnetic impulse recording members, and methods of making magnetic material
GB1437409A (en) Methods of making acicular goethite powder
JPS5218302A (en) Magnetic sheet recording/playing method
FR1144573A (en) Magnetic tape recording machine
GB1486291A (en) Magnetic recording
GB1417505A (en) Acicular ferrimagnetic iron oxide containing cobalt and silicon oxide and its production
USD56569S (en) Design for a sound-reproducing cabinet
JPS529900A (en) Manufacturing method of ferromagnetic metallic powder