JPS4975116A - - Google Patents
Info
- Publication number
- JPS4975116A JPS4975116A JP48114878A JP11487873A JPS4975116A JP S4975116 A JPS4975116 A JP S4975116A JP 48114878 A JP48114878 A JP 48114878A JP 11487873 A JP11487873 A JP 11487873A JP S4975116 A JPS4975116 A JP S4975116A
- Authority
- JP
- Japan
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
- G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
-
- 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
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT898672A AT343373B (de) | 1972-10-20 | 1972-10-20 | Magnetogrammtrager zur nicht unbemerkt veranderbaren aufzeichnung magnetischer signale und verfahren zur herstellung solcher aufzeichnungen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4975116A true JPS4975116A (OSRAM) | 1974-07-19 |
| JPS576163B2 JPS576163B2 (OSRAM) | 1982-02-03 |
Family
ID=3610215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11487873A Expired JPS576163B2 (OSRAM) | 1972-10-20 | 1973-10-15 |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3883892A (OSRAM) |
| JP (1) | JPS576163B2 (OSRAM) |
| AT (1) | AT343373B (OSRAM) |
| BE (1) | BE806345A (OSRAM) |
| CA (1) | CA1003954A (OSRAM) |
| DE (1) | DE2344644C2 (OSRAM) |
| FR (1) | FR2204006B1 (OSRAM) |
| GB (1) | GB1439213A (OSRAM) |
| IT (1) | IT994466B (OSRAM) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1524187A (en) * | 1974-10-16 | 1978-09-06 | Emi Ltd | Magnetic recording |
| US4239959A (en) * | 1977-03-23 | 1980-12-16 | General Kinetics Incorporated | Perpetuation of information in magnetically recorded medium |
| DE2950174A1 (de) * | 1979-12-13 | 1981-06-19 | Basf Ag, 6700 Ludwigshafen | Verfahren und vorrichtung zur echtheitspruefung von aufzeichnungstraegern, die gegen faelschung zu sichern sind |
| DE2950129A1 (de) | 1979-12-13 | 1981-06-19 | BASF Corp., New York, N.Y. | Verfahren und vorrichtung zur echtheitspruefung von aufzeichnungstraegern, die gegen faelschung zu sichern sind |
| US4404603A (en) * | 1980-05-27 | 1983-09-13 | Warren Eugene D | Apparatus and method for inspecting magnetic tape recorded material for alterations |
| DE3676022D1 (de) * | 1985-03-18 | 1991-01-17 | Mcwhirter Holdings Pty Ltd | Magnetische bandkassette mit einem vorher aufgezeichneten tonfrequenzsignal. |
| US4858036A (en) * | 1986-08-04 | 1989-08-15 | Peter Ginkel | Software protection and identification system |
| US4980782A (en) * | 1985-06-03 | 1990-12-25 | Peter Ginkel | Software protection and identification system |
| US4639584A (en) * | 1985-07-25 | 1987-01-27 | Adams Robert T | Non-alterable magnetic coding |
| US4706282A (en) * | 1985-12-23 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Decoder for a recorder-decoder system |
| JPH04105458U (ja) * | 1991-01-16 | 1992-09-10 | 日本電池株式会社 | 電池用液口栓部 |
| US5533759A (en) * | 1994-09-13 | 1996-07-09 | Eastman Kodak Company | Method of currency or document validation by use of a temperature sensitive magnetic pattern |
| JP2001076331A (ja) * | 1999-09-02 | 2001-03-23 | Toshiba Corp | 磁気記録媒体及び磁気記録再生装置 |
| DE10008097A1 (de) * | 2000-02-22 | 2001-09-20 | Forschungszentrum Juelich Gmbh | Markierungseinrichtung sowie Verfahren zum Auslesen einer solchen Markierungseinrichtung |
| EP1662486A1 (en) * | 2004-11-29 | 2006-05-31 | EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt | Process for storing information in a magnetic multi-layer device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3134094A (en) * | 1963-07-02 | 1964-05-19 | Litton Systems Inc | Spin resonant transducer |
| US3648257A (en) * | 1966-08-24 | 1972-03-07 | Minnesota Mining & Mfg | Sheetlike material, the method of storing an image consisting of differing magnetic, electrical, and optical properties |
| US3521294A (en) * | 1967-03-13 | 1970-07-21 | Ampex | Magneto thermal recording process and apparatus |
| FR1524309A (fr) * | 1967-03-29 | 1968-05-10 | Centre Nat Rech Scient | Mémoires d'informations binaires à structures magnétiques en couches minces |
-
1972
- 1972-10-20 AT AT898672A patent/AT343373B/de not_active IP Right Cessation
-
1973
- 1973-09-05 DE DE2344644A patent/DE2344644C2/de not_active Expired
- 1973-10-15 JP JP11487873A patent/JPS576163B2/ja not_active Expired
- 1973-10-16 US US406972A patent/US3883892A/en not_active Expired - Lifetime
- 1973-10-17 CA CA183,558A patent/CA1003954A/en not_active Expired
- 1973-10-18 GB GB4857073A patent/GB1439213A/en not_active Expired
- 1973-10-18 FR FR7337260A patent/FR2204006B1/fr not_active Expired
- 1973-10-19 IT IT53243/73A patent/IT994466B/it active
- 1973-10-22 BE BE136919A patent/BE806345A/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2204006B1 (OSRAM) | 1977-03-11 |
| FR2204006A1 (OSRAM) | 1974-05-17 |
| BE806345A (fr) | 1974-04-22 |
| AT343373B (de) | 1978-05-26 |
| JPS576163B2 (OSRAM) | 1982-02-03 |
| DE2344644C2 (de) | 1982-04-15 |
| DE2344644A1 (de) | 1974-05-02 |
| CA1003954A (en) | 1977-01-18 |
| ATA898672A (de) | 1977-09-15 |
| GB1439213A (en) | 1976-06-16 |
| IT994466B (it) | 1975-10-20 |
| US3883892A (en) | 1975-05-13 |