| Patents for G11B 23 - 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 (25,121) |
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| 08/11/1981 | US4283022 Double-volumed tape cartridge operative at two ends |
| 08/11/1981 | CA1106968A1 Magnetic disk cartridge |
| 08/11/1981 | CA1106805A1 Storage case |
| 08/11/1981 | CA1106665A1 Audiovisual card reproducing device |
| 08/06/1981 | WO1981002236A1 Process for making discs |
| 08/06/1981 | WO1981002137A1 Information carrying discs |
| 08/04/1981 | US4282554 Enclosed disc drive with improved air flow |
| 08/04/1981 | CA1106493A1 System for automatically correcting the duty factor of the carrier wave arising from reading-out a data carrier |
| 07/29/1981 | EP0032771A1 Information recording and/or reading system |
| 07/28/1981 | US4281346 Complementary pre-emphasis and de-emphasis circuits for a video signal transfer channel |
| 07/28/1981 | US4281043 Polymodal magnetic recording media and compositions useful therein |
| 07/28/1981 | US4280670 Winding core for magnetic tape adapted for stacking |
| 07/28/1981 | CA1106061A1 Rotary recording medium with intermediate pits |
| 07/21/1981 | US4280158 Magnetoresistive reading head |
| 07/21/1981 | US4280155 Method of improving air flow in compact disc drive |
| 07/21/1981 | US4280136 Tape cassette and label inspection system therefor |
| 07/21/1981 | CA1105441A1 Cleaning and lubricating compositions |
| 07/15/1981 | EP0031927A1 Tape cassette for striplike or tapelike record carriers, especially magnetic tapes |
| 07/14/1981 | US4278258 Container for holding at least one recording disk and disk playing system |
| 07/14/1981 | US4278174 Display and storage assembly |
| 07/14/1981 | CA1105173A1 Protective compositions for recording |
| 07/09/1981 | WO1981001907A1 Indicator device for cassettes loaded with magnetical information carrier |
| 07/09/1981 | WO1981001906A1 Information recording apparatus with a disc loaded in a cassette |
| 07/09/1981 | WO1981001905A1 Recording diskette having flocked-fiber wiping fabric and method of making |
| 07/09/1981 | WO1981001903A1 A method for recording track marking information on flexible magnetical information carrier discs and apparatus for fine adjustment of the position of a reading head |
| 07/08/1981 | EP0031691A1 Tape cassette device |
| 07/07/1981 | US4277810 Floppy disc structure with rectangular casing |
| 07/07/1981 | US4277071 Disc records having surface markings |
| 07/07/1981 | CA1104717A1 Video disc insertion/extraction system for a video disc player |
| 07/01/1981 | EP0031060A1 Method and device for testing the trueness of record carriers protectable against falsification |
| 07/01/1981 | EP0031017A1 Process for winding magnetic tapes on tape reels of a magnetic tape cassette, and device for carrying out this process |
| 06/30/1981 | US4275943 Container for a cassette |
| 06/30/1981 | CA1104251A1 Rotatable record carrier and method and apparatus for producing same |
| 06/30/1981 | CA1104247A1 Recording and playback method and apparatus |
| 06/24/1981 | EP0030700A2 Arrangement for equalizing an unmodulated wide-band signal, in particular a colour-video signal, in a signal recording/reproducing system |
| 06/24/1981 | EP0030690A1 Method and device for testing the trueness of record carriers protectable against falsification |
| 06/24/1981 | EP0030623A1 Methods of fabricating magnetic records, magnetic records so fabricated, and magnetic recording and reproducing apparatus comprising such fabricated magnetic records |
| 06/23/1981 | US4275424 Scanning type magnetic recorder and cassette |
| 06/23/1981 | US4275108 Leader or trailer tape for a magnetic tape |
| 06/23/1981 | US4275101 Video disc lubricants |
| 06/23/1981 | US4275100 Video disc processing |
| 06/23/1981 | US4275091 Method of duplicating plastics information carriers |
| 06/23/1981 | US4274605 Reel technology |
| 06/17/1981 | EP0030367A1 Magnetic recording tape cassette |
| 06/17/1981 | EP0030237A1 Process for protecting sound recording carrier and the labels and/or packages thereof against counterfeiting |
| 06/16/1981 | US4274119 Recording disk cover and player apparatus for removing cover |
| 06/16/1981 | US4273342 Protective cartridge for optical discs |
| 06/10/1981 | EP0029946A1 Arrangement for storing and relocating positions on record carriers in tape form in a recording and/or reproducing apparatus |
| 06/09/1981 | US4272796 Automatic cassette cleaner |
| 06/09/1981 | US4272795 Information storage system and recording cartridge having precise alignment features |
| 06/09/1981 | US4272793 System and method for positioning a magnetic head transducer on a flexible storage media |
| 06/09/1981 | US4272786 Video disc playback apparatus with non-linear aperture correction |
| 06/09/1981 | US4272574 Optically readable information disc |
| 06/09/1981 | US4271963 Disk pack handle mechanism |
| 06/09/1981 | US4271961 Box for tools and accessories for tape cassettes, especially for magnetic tape cassettes |
| 06/09/1981 | US4271955 Cassette correlator |
| 06/02/1981 | US4271442 Plane magnetic recording medium |
| 06/02/1981 | US4271441 Integral shield and bias element for magnetic tape cassettes |
| 06/02/1981 | US4271439 Electronic gain and noise control for recording of analog information |
| 06/02/1981 | US4270854 Photographic instant camera with magnetic recording capability |
| 06/02/1981 | US4270817 Cassette storage and dispensing device |
| 05/27/1981 | EP0029221A1 Magnetic recording tape cassette |
| 05/27/1981 | EP0029064A1 Gas circulation and filtration apparatus for magnetic disc recording systems |
| 05/27/1981 | EP0029037A1 Arrangement for the printing of visible markings on a sound tape or a film |
| 05/20/1981 | EP0028708A1 Cleaning cassette for cassette recorder |
| 05/19/1981 | US4268878 Gas circulation and filtration apparatus for magnetic disc recording systems |
| 05/19/1981 | US4268877 Recording and/or playback machine which affords use of various sized magazines |
| 05/19/1981 | US4267986 Magnetic tape cassette |
| 05/12/1981 | US4266784 Video disc caddy having disc entrapment |
| 05/12/1981 | US4266738 Tape reel |
| 05/12/1981 | CA1101119A1 Multiple pack magnetic disk system |
| 05/12/1981 | CA1100859A1 Automatic cassette loader |
| 05/06/1981 | EP0028058A1 Method of and apparatus for cutting and joining together strip materials |
| 05/05/1981 | US4266256 Cleaner ribbon for magnetic tape |
| 05/05/1981 | US4265369 Tape cartridge dispenser |
| 05/05/1981 | CA1100632A1 Self centering disk |
| 05/05/1981 | CA1100629A1 Grounded transducer for magnetic record disks |
| 04/30/1981 | WO1981001216A1 Improved tone arm structure and device for heading record disk by special song selection plate for record player |
| 04/29/1981 | EP0027653A1 A hub for use in a magnetic recording tape cassette and a magnetic recording tape cassette comprising at least one such hub |
| 04/28/1981 | US4264551 Recorded disk reproducing system |
| 04/28/1981 | US4264402 Automatic tape winding machine |
| 04/28/1981 | US4264223 Reversible ribbon cartridge for a high speed impact printer |
| 04/28/1981 | CA1100230A1 Apparatus and method for reproducing video signals |
| 04/21/1981 | US4263634 Magnetic disk-jacket assembly |
| 04/21/1981 | US4263628 Magnetic transducing tape transport system |
| 04/21/1981 | US4262860 Tape cartridge with increased tape capacity |
| 04/21/1981 | US4262856 Tape reel |
| 04/14/1981 | CA1099405A1 Magnetic recording tape cartridge |
| 04/08/1981 | EP0026552A2 Apparatus for controlling the motion of an elongated object; case for a tape-like information carrier provided with such apparatus; apparatus for writing, reading or erasing information on a tape-like information carrier contained in such a case |
| 04/08/1981 | EP0026551A1 A case provided with a conveying means for conveying tape-like information carrier as well as an apparatus for writing, reading or erasing information to be utilized in combination with such a case |
| 04/08/1981 | EP0026550A2 A case with an information carrier consisting of a tape one side of which has a structure carrying optically readable information, as well as an apparatus for writing, reading or erasing such information |
| 04/08/1981 | EP0026475A1 Process and apparatus for centering and axially positioning a disk-shaped recording medium |
| 04/08/1981 | EP0026320A1 Data recorder/reader and method of operating same |
| 04/07/1981 | US4261021 Cassette labeling apparatus |
| 04/07/1981 | US4260858 Videodisc player with drive means engaging videodisc guide groove |
| 04/07/1981 | US4260161 Arrangement for vibrationless coupling of a phonograph record with the turntable of a phonograph |
| 04/01/1981 | EP0025914A1 Tape cassette and tape apparatus, in particular magnetic tape cassette and magnetic tape apparatus |
| 04/01/1981 | EP0025827A1 Flexible magnetic data storage disk jacket assemblies |
| 03/31/1981 | US4259433 Method for producing disk-recording plates |
| 03/31/1981 | US4258961 Magnetic tape cassette container support |