| Patents for G11B 21 - Head arrangements not specific to the method of recording or reproducing (20,963) |
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| 11/27/1979 | US4176378 Signal pickup arm lifting/lowering and groove skipper apparatus |
| 11/20/1979 | US4175275 R/W Arm that prevents catastrophic failure |
| 11/13/1979 | CA1066410A1 Positioning device for the access arm of the magnetic head of a magnetic disk storage |
| 11/13/1979 | CA1066407A1 Initialization circuitry for magnetic recording system |
| 11/13/1979 | CA1066406A2 Magnetic record member for use with rotating head magnetic recording apparatus |
| 11/06/1979 | US4173348 Grooved record playback system |
| 10/30/1979 | CA1065483A1 Locked groove detection and correction in video disc playback apparatus |
| 10/30/1979 | CA1065480A1 Magnetic sheet player for audiovisual teaching purposes |
| 10/30/1979 | CA1065479A1 Method and apparatus for aligning read/write heads in a disc recorder |
| 10/17/1979 | EP0004738A1 Video disc player |
| 10/09/1979 | US4170783 Signal pickup device for reproducing an information signal recorded on a track of a rotary recording medium |
| 10/09/1979 | CA1064160A1 Actuator for a disc drive apparatus |
| 10/03/1979 | EP0004476A1 Time base error correction for optical disc players |
| 10/02/1979 | CA1063726A1 Playback system signal pickup return mechanism |
| 10/02/1979 | CA1063723A1 Device for writing and/or reproducing information in respectively from a rotating disk-shaped record carrier |
| 10/02/1979 | CA1063660A1 Hydrostatic bearing apparatus |
| 10/02/1979 | CA1063520A1 Disc record locked groove skipper |
| 09/18/1979 | CA1062807A2 Method and apparatus for supporting tape along a path of a rotating head |
| 09/11/1979 | US4167765 Transducer suspension mount apparatus |
| 09/04/1979 | US4166970 Apparatus and method for shifting a head movable relative to a carrier for recorded information |
| 08/28/1979 | CA1061461A1 Data storage apparatus |
| 08/28/1979 | CA1061459A1 Tape lifter |
| 08/21/1979 | CA1060989A1 Accessing magnetic head arm assembly and suspension |
| 08/14/1979 | US4164769 Cross band coupling for stepper-motor-driven, rigid magnetic disc |
| 08/14/1979 | US4164756 Disc record groove skipper |
| 08/08/1979 | EP0003339A1 Device for the precise positioning of a transducing head in recording systems |
| 08/07/1979 | US4163994 Automatic head tracking system utilizing transducer deflecting means and synchronous demodulation of the envelope signal |
| 07/31/1979 | US4163267 Flying head with compound-foil |
| 07/31/1979 | US4163265 Magnetic disc memory and magnetic disc for this memory |
| 07/31/1979 | CA1059617A1 Magnetic recorder test article and methods |
| 07/25/1979 | EP0003100A2 Ferrimagnetic iron oxide and method of manufacturing the same |
| 07/25/1979 | EP0003070A1 Sampled data positioning system employing a model of the physical system for time optimal control |
| 07/24/1979 | US4162511 Velocity correction system for video disc player |
| 07/10/1979 | US4161004 Head positioning mechanism for recording/playback machine |
| 07/10/1979 | CA1058318A1 Pickup arm cartridge |
| 06/05/1979 | US4157577 Rotatable storage apparatus with digitally responsive circuitry for track selection |
| 05/30/1979 | EP0002133A1 Positioning servo mechanism |
| 05/22/1979 | CA1055154A1 Rotating memory accessing mechanism |
| 05/01/1979 | US4152736 Magnetic disk file |
| 05/01/1979 | US4152728 Releasable carriage drive unit for an optical disc player |
| 05/01/1979 | US4152727 Reproducing transducer capable of tracking control |
| 04/24/1979 | US4151573 Magnetic recording device for double sided media |
| 04/24/1979 | US4151569 Positionable transducer mounting structure using a piezoelectric bender element |
| 04/24/1979 | US4151567 Circuit arrangement for offsetting the data heads of a data cylinder memory by a determinate amount from the mid-position of the data cylinder |
| 04/17/1979 | US4150407 Electrically controllable carrying-arm arrangement |
| 04/17/1979 | US4149669 Reading and recording equipment for cards with a magnetic data carrier |
| 04/10/1979 | US4149199 Magnetic disc storage device with track centering correction |
| 04/10/1979 | US4149198 Transducer positioning system |
| 03/20/1979 | US4145725 Electromagnetic actuator |
| 03/13/1979 | US4144549 Transducer positioning device |
| 03/07/1979 | EP0000946A2 Apparatus for controlling the movement of the data head in a moving-head data recording system |
| 03/06/1979 | US4143409 Transducer feeding mechanism in an apparatus for recording and reproducing a signal on and from a rotary recording medium |
| 03/06/1979 | US4142729 Gramophone equipment |
| 03/06/1979 | CA1050163A1 Reading head for video disc player |
| 03/06/1979 | CA1049932A1 Soundhead restore mechanism |
| 02/27/1979 | US4142209 Disc track servo system |
| 02/20/1979 | US4141049 Loading mechanism for negative pressure sliders |
| 02/20/1979 | CA1049139A1 Pickup arm control for video disc player |
| 02/13/1979 | US4139874 Magnetic disc recording and/or reproducing apparatus with means to damp and lock disk rotation |
| 02/06/1979 | US4138741 Disc eccentricity compensating system |
| 02/06/1979 | US4138728 Electronic tachometer with variable bandwidth differentiator |
| 02/06/1979 | US4138696 Device for automatically recording, reproducing and translating, a magnetic transducer |
| 01/23/1979 | US4136369 Disc recorder with lead screw drive |
| 01/23/1979 | US4136365 Magnetic disc storage devices having compensation for dimensional changes |
| 01/16/1979 | US4135217 Utilization of stored run-out information in a track following servo system |
| 01/16/1979 | US4135086 Automatic record player of linear tracking pickup arm type |
| 01/10/1979 | EP0000261A1 Positioning system employing feedforward and feedback control |
| 01/09/1979 | US4134053 Method and means for capturing magnetic tracks |
| 01/02/1979 | US4133015 Head positioner for disc recorders |
| 01/02/1979 | US4133011 Sampled data positioning system employing a model of the physical system for time optimal control |
| 12/26/1978 | US4131923 Magnetic-head locating arrangement for floppy-disk mechanisms |
| 12/26/1978 | US4131921 Head positioning system for disc files |
| 12/19/1978 | US4130844 Method and means for tracking magnetic tracks |
| 12/19/1978 | CA1044804A1 Transducer positioning system |
| 11/21/1978 | CA1043010A1 Data storage mechanism having a flexible magnetic disk |
| 11/14/1978 | US4125882 Disc file system with improved seek control |
| 11/07/1978 | US4124872 Record/playback apparatus |
| 11/07/1978 | US4124868 Head control means for optical videodisc player |
| 10/31/1978 | US4123788 Magnetic information carrier with optical servo tracks and apparatus for reading and writing the same |
| 10/24/1978 | US4122503 Positioning system and method particularly useful for magnetic disk drives |
| 10/24/1978 | US4122499 Video signal recording and reproducing system for special motion effects |
| 10/17/1978 | US4121265 Temperature compensation for data storage apparatus |
| 10/17/1978 | CA1040740A1 Track following servo system |
| 10/10/1978 | US4120010 Air bearing head support |
| 10/03/1978 | CA1039845A1 Magnetic tape reproducing system |
| 09/26/1978 | US4117522 Isthmian precision adjustable mount for magnet head assembly |
| 09/26/1978 | CA1039401A1 Velocity correction transducer |
| 09/19/1978 | US4115823 Track following servosystem for data storage apparatus |
| 09/19/1978 | CA1038959A1 Video recording and/or reproducing apparatus, and record assembly for use therein |
| 09/12/1978 | US4114181 Recording reproducer for magnetic cards |
| 09/12/1978 | CA1038492A1 Stacked flexible record disk storage apparatus having enhanced disk separation using a primary bending mode in a stack of disks |
| 09/12/1978 | CA1038491A1 Stacked flexible record disk storage apparatus having enhanced disk separation with transducer mounted in disk separator |
| 09/05/1978 | US4112472 Longitudinal scan, cam shaped, turntable rotor for magnetic recording |
| 08/15/1978 | US4107746 Continuous spiral mode tracking in a conventional disk drive using concentric servo tracks |
| 08/08/1978 | US4106058 Data disc optical reader containing a device for automatic data access |
| 08/01/1978 | US4104573 Speed control device for a moving member |
| 07/25/1978 | US4103314 Motion control system |
| 07/18/1978 | US4101009 Non reactive positioning device |
| 07/04/1978 | US4098032 Method of forming air bearing rails of head assemblies |
| 06/20/1978 | US4096579 Velocity control apparatus for disk drive |