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| Number | Title | Issue Date |
| 4625162 | Fusible link short detector with array of reference fuses Circuitry is provided for testing fusible link arrays for short circuits around the fusible links. The resistance of each corresponding link in each of the four quandrants in the array is compared with the resistance of an array of reference fusible links... | 11/25/1986 |
| 4533582 | Stabilized magnetic recording materials and process for tailoring and stabilizing of magnetic recording materials A storage stable, pre-selected magnetic coercivity is imparted to a recording disk having a film of heat curable magnetic coating composition thereon by curing the composition in an anaerobic atmosphere at a high temperature, and then heating, typically i... | 08/06/1985 |
| 4521451 | Encapsulated magnetic recording disk A hermetically encapsulated magnetic record member is produced by applying a liquid mixture containing one or more organometallic compounds, an organic solvent system and magnetic particles to a thermally stable substrate, preferably of silicon. The appli... | 06/04/1985 |
| 4520647 | Surface finishing process A method for modifying the surface properties of a material which applies a deformational force which exceeds the elastic limit of the material at the surface so that a plastic deformation of the surface occurs without modifying the bulk properties of the... | 06/04/1985 |
| 4515828 | Planarization method A process for producing an extremely smooth or planarized layer of material employs a polymeric material which, when melted has a viscosity enabling it to flow into all crevices and voids on the treated surface. Subsequent heating cures the polymer to for... | 05/07/1985 |
| 4511938 | Magnetizable recording disk and disk file employing servo sector head positioning A magnetizable recording disk is divided into data and servo sectors. The servo sectors include position reference information comprising a circumferentially extending and radially repeated magnetization pattern. Each such pattern comprises at least three... | 04/16/1985 |
| 4490796 | Print head motor control system using analog and digital feedback A control system for a bidirectional printer having a print head carriage movable at different speeds on different printing lines employs a microcomputer which generates a desired velocity profile for the carriage motion. This desired velocity profile is ... | 12/25/1984 |
| 4490756 | Servo encodement and detection system using tetra-orthogonal servo pattern A track-seeking and track-following servo encodement and detection system employs a servo pattern using a reference signal and control signals, the control signals having an orthogonal phase relationship to each other by cyclically revolving in phase by 9... | 12/25/1984 |
| 4488188 | Buried servo recording system using phase encoded servo pattern A track following servo system for a magnetic disk file employs a buried servo pattern having two types of signals therein. The first is a reference signal of frequency f and the second type are control signals of frequency 2f, adjacent control signals be... | 12/11/1984 |
| 4486797 | Sliding mask variable resolution velocity trajectory for track following servo A servo system generates a velocity profile for moving a load from one position to another by dividing the time during which the load is moving into a plurality of segments, each segment being one half as long as the preceding segment. For each segment a ... | 12/04/1984 |
| 4479090 | Circuitry for measuring magnetic head flying characteristics A method for monitoring characteristics of a magnetic recording head which is flying in an air bearing relationship over a rotating magnetic recording disk containing Fe2 O3 detects triboelectric charges generated by intermittent con... | 10/23/1984 |
| 4463435 | Printer control system with controlled acceleration and deceleration In a control system for a bidirectional printer capable of printing at different speeds on different lines, stored values representing the ideal velocities during the acceleration and deceleration of the print carriage for each direction and speed are com... | 07/31/1984 |
| 4460968 | Print head motor control with stop distance compensation A control system for a bidirectional printer having a print head carriage movable at different speeds on different printing lines provides for equal stopping distance in the margin at both high and low speed operation. This is accomplished by delaying the... | 07/17/1984 |
| 4459675 | Printer control system with error count averaging In a control system for a bidirectional printer capable of printing at different speeds on different lines and in which the actual velocity of the print carriage is compared with a desired velocity profile to generate an error count, the error count is me... | 07/10/1984 |
| 4459253 | Manufacture of homogeneous magnetic recording structure A new magnetic medium permits magnetic recording either in the longitudinal or the vertical direction. The medium, unlike prior art structures, does not require a nonmagnetic substrate. The medium is a rigid magnetic disk homogeneously prepared from ferri... | 07/10/1984 |
| 4454549 | Slant track sector servo A sector servo system for a magnetic disk file employs servo signals in the sectors which are recorded at a slant relative to the data tracks. Using digital techniques, the slanted servo tracks produce information relative to the amount and direction of t... | 06/12/1984 |
| 4451532 | Magnetic recording composition employing mono-dispersed spherical load-bearing particles A magnetic recording composition contains load-bearing particles which consist of a monodispersion of spherical particles distributed throughout the coating. The spherical particles have a diameter somewhat in excess of the finished coating thickness so a... | 05/29/1984 |
| 4451495 | Increasing magnetic particle concentration in magnetic coatings A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to t... | 05/29/1984 |
| 4438467 | Magnetic disk track following servo burst amplitude drop compensation To compensate for drops in the amplitude of signals read from magnetic records, in particular servo signals, a complementary correction signal is produced from the signal drops by rectifying, low-pass filtering, differentiating, integrating and forming th... | 03/20/1984 |
| 4438156 | Mono-particle magnetic dispersion in organic polymers for magnetic recording A method for producing a magnetic recording composition involves preparing an aqeuous dispersion of magnetic particles and colloidal silica particles, the pH of this dispersion being adjusted so that the magnetic and silica particles are electrostatically... | 03/20/1984 |
| 4426265 | Method of producing a metallic thin film magnetic disk For a metallic thin film magnetic disk, a chromium undercoat and a magnetic layer, in particular of an FeCoCr alloy, are obliquely sputtered by means of a sputtering system onto a substrate at an angle of incidence of about 60°. The operating pressure of... | 01/17/1984 |
| 4415942 | Magnetic disk substrate of fiber-reinforced plastic The substrate 1 for magnetic disks takes the form of a laminate made up of a plurality of individual thin, fiber-reinforced, anisotropic and unidirectional lamellae. These lamellae are arranged staggered on top of each other at few angular spacings, i.e.,... | 11/15/1983 |
| 4415634 | Magnetic disk substrate with a core of synthetic material A substrate for a magnetic recording disk employs an annular core of synthetic material having thin metal foils bonded to opposite faces, the metal foils serving to receive a magnetic recording material to form a magnetic recording structure. The inner su... | 11/15/1983 |
| 4414591 | Dual access flexible disk drive A drive is provided which accepts a cartridge containing a flexible magnetic recording disk and provides for simultaneous transducer access to both recording surfaces of the disk. The cartridge is inserted into a tray in the drive and then rotated in the ... | 11/08/1983 |
| 4412165 | Sampled servo position control system Servo records provided at intervals on a record medium are used in a sampled servo system to define data tracks on the medium. Asperities in the medium, or problems arising from the servo writing process can in some instances lead to mis-alignment of a se... | 10/25/1983 |
| 4410440 | Polyurethane magnetic disk coatings A polyurethane coating material for magnetic recording disks which is composed of magnetic particles, solvent blends and a thermosetting binder system. The resins are made from blocked isocyanates or blocked polyisocyanates with polyacrylates which contai... | 10/18/1983 |
| 4400246 | Process for applying barrier layer anodic coatings A barrier anodizing process for an aluminum alloy substrate employs an anodizing current having a density between 20 and 300 milliamps/cm2 to produce a 300 volt barrier layer in respectively 60 and 4 second... | 08/23/1983 |
| 4397751 | Magnetic disk coatings A magnetic disk coating composition contains magnetic particles and a binder system comprising epoxy and phenolic resins, a titanate coupling agent and a water miscible solvent system, the coating having a pigment volume concentration of up to 35.... | 08/09/1983 |
| 4396960 | Servo track following control for magnetic heads, and method for compensating uniform disturbance variables For the servo track control of magnetic heads over magnetic tracks, in addition to the main servo position signals arranged in offset fashion to the middle of the track, auxiliary servo position signals are provided symmetrically on each side of the middl... | 08/02/1983 |
| 4390911 | Signal separation in magnetic recording using buried servo A servo system provides track following servo information from a buried servo layer disposed under the data recording layer, using the same transducer for simultaneously reading the servo information and writing data. To prevent the voltage generated in t... | 06/28/1983 |
| 4376963 | Composite magnetic recording disk A composite structure for magnetic recording includes a core member of polymeric material to which is bonded at least one silicon disk having a magnetic recording material on its outer surface. The silicon disk surface provides optimal flatness and smooth... | 03/15/1983 |
| 4376960 | Flexible disk stabilizing structure A magnetic recording device for non-contact recording on a flexible disk employs a Bernoulli plate to stabilize the rotating disk. The plate is slightly concave and has a number of small orifices therein through which air is drawn by the disk rotation to ... | 03/15/1983 |
| 4376588 | Bi-directional serial printer with look-ahead A bi-directional serial printer has a look-ahead feature which determines the distance between the margin of the line being printed and the margin, in the direction of the print head travel, of the next line to be printed. If this distance is less than a ... | 03/15/1983 |
| 4376587 | Print ribbon protection In a printing system employing a spliced endless print ribbon, an opening is provided in the ribbon adjacent the splice to enable sensing of the approach of the splice to the print station. Printing is suspended as the splice passes the print station to a... | 03/15/1983 |
| 4333961 | Preparation of thin, aligned magnetic coatings A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to t... | 06/08/1982 |
| 4328607 | Manufacturing process for foil magnetic recording disks A magnetic recording device employing a thin foil member is fabricated by radially compressing a ring member, securing the periphery of the foil member to the compressed ring, releasing the compression on the ring so that it expands to produce tension in ... | 05/11/1982 |
| 4328435 | Dynamically switchable logic block for JK/EOR functions A circuit provides either the J-K logic function or the Exclusive Or (EOR) logic function depending upon a control signal. The circuit includes a conventional cross-coupled EOR block with two inputs, the logic function being performed by the block dependi... | 05/04/1982 |
| 4320422 | File protect sleeve Structure for providing a file protect function for a cartridge which houses a magnetic recording medium includes a sleeve molded integrally with the cartridge. The sleeve has diametrically opposed slots and a rotary file protect actuator disposed in the ... | 03/16/1982 |
| 4320421 | Rotary actuator for file protect function Structure for providing a file protect function for a removable cartridge which houses a magnetic recording medium includes a rotary actuator in a sleeve member, the actuator having an outer disk and an inner disk. The actuator may be rotated in the sleev... | 03/16/1982 |
| 4317150 | Foil recording disk structures A magnetic recording device employing one or more thin circular foil members which are secured to a supporting member on at least the outer edges of the foil members. In one embodiment, the foil members have central openings therein, with the central open... | 02/23/1982 |
