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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4868690 | Self-initializing 1,7 code decoder with low sensitivity to errors in preamble A 1,7 decoder is repeatedly initialized during reading of the synchrofield of the record. The decoder includes an oscillator responsive to the record to produce a binary read signal having a frequency f. A first divider produces a source data clock signal... | 09/19/1989 |
| 4868695 | Head/arm lock mechanism for a disk drive A head/arm lock mechanism includes a pawl mounted to the armature of a bistable solenoid, the armature being stable in either of two rotary positions. The armature and pawl are limited to move through an angle less than that defined by the stable position... | 09/19/1989 |
| 4866741 | 3/2 Frequency divider A 3/2 frequency divider employs two D-type flip-flops, an OR gate and an AND gate arranged to respond to an input signal at a frequency f to derive an output signal at a frequency 2/3 f. The frequency divider is employed in a code converter to encode or d... | 09/12/1989 |
| 4827611 | Compliant S-leads for chip carriers A compliant S-shaped lead for resiliently supporting an integrated circuit chip package in spaced relation generally parallel to a printed circuit board. The S-lead bends and twists to absorb forces which would otherwise be exerted on solder joints due to... | 05/09/1989 |
| 4823209 | 1,7,2,3 Encoding/decoding employing 3/2 frequency division An encoding/decoding system for 1,7,2,3 codes employs an oscillator having a frequency f and dividers providing signals at frequencies equal to 1/3 f and 2/3 f. A code converter is responsive to the three signals to encode or decode data. A 3/2 frequency ... | 04/18/1989 |
| 4819111 | Thin film head with reduced cross section in the core for causing magnetic saturation in the leading leg's throat area A thin film magnetic recording head has a flux path in which during writing magnetic saturation occurs in the throat section of the leading pole rather than in the trailing pole. This keeps the stray magnetic fields generated in the area where the saturat... | 04/04/1989 |
| 4813059 | Readback recovery of run length limited codes Run length limited codes, such as (1,7) codes are recovered with a dual channel recovery system in which the high resolution channel normally supplies the output (recovered) signal. The low resolution channel includes a detector, such as a delay device an... | 03/14/1989 |
| 4811135 | Tri-phase servo pattern for providing information for positioning the transducers of a magnetic disk storage drive Servo data, including three types of servo patterns distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of only one type of pattern, with consecutive tracks arranged... | 03/07/1989 |
| 4804336 | Double fifty plug-socket connector A double density plug and socket electrical connector employing the same form factor as existing 50 pin subminiature "D" connectors. Adapted for use on printed circuit boards the connector can compatibly interconnect 50 pin or 100 pin electrical connector... | 02/14/1989 |
| 4800454 | Static charge protection for magnetic thin film data transducers A thin film magnetic data transducer carried on the end of a conductive flyer has its magnetic pole electrically connected to the flyer to prevent electrostatic discharges between the flyer and the pole tip from eroding the pole tip. The winding of the tr... | 01/24/1989 |
| 4748738 | High strength magnet-pole piece assembly tool Apparatus for assembling a pair of high strength magnets and the common pole piece into a unit for use in a disk drive includes a bed with a channel in which the magnets can slide or translate, and a stop centrally located in the channel to prevent execes... | 06/07/1988 |
| 4712076 | Circuit for phase locking a clock signal to a series of pulses A circuit for phase locking a clock signal to a series of data pulses includes a wide band signal generator, a power supply, a flip-flop, a loop filter and a voltage controlled oscillator ("VCO"). The circuit adds current or subtracts current from the loo... | 12/08/1987 |
| 4708660 | Connector for orthogonally mounting circuit boards A connecting device is disclosed for electrically and mechanically linking multiple circuit boards arranged in two perpendicular stacks. The connecting device includes two identical connectors, each with a plurality of outwardly extended electrical socket... | 11/24/1987 |
| 4677458 | Ceramic IC package attachment apparatus An integrated circuit package includes a leadless ceramic chip carrier and four connectors mounted thereto. The chip carrier has a rectangular surface with a plurality of conductive pads at its periphery. Each connecter includes a set of elongate conducti... | 06/30/1987 |
| 4668097 | Epoxy mixing system Apparatus is shown for mixing an epoxy adhesive. An epoxy resin and its associated curing agent are simultaneously loaded from separate cartridges into a length of flexible PVC tubing, part of which is contained between a rotor and a stator. Bearings, mou... | 05/26/1987 |
| 4646193 | Disk cartridge assembly A disk cartridge assembly includes a rotatable magnetic disk enclosed within a rectangular cartridge. Attached to the top and bottom covers of the cartridge are a plurality of leaf springs which urge the top and bottom sections toward and against one anot... | 02/24/1987 |
| 4623952 | Damped static eliminator for disk drives A static eliminator comprises a contact mounted to a gimbal spring backed by a damping pad supported by a load spring. The contact bears against the polished end surface of the motor shaft of a disk drive so static electricity is grounded through the gimb... | 11/18/1986 |
| 4594590 | Demand driven access mechanism A demand driven access mechanism comprises logic apparatus at each station capable of seizing use of the shared communication channel for enabling access by a selected single station. The logic apparatus receives status signals from all stations so that i... | 06/10/1986 |
| 4584686 | Reed-Solomon error correction apparatus Disclosed is a Reed-Solomon error correction apparatus which is programmable to perform several distinct error correction functions. The apparatus performs the following functions: encoding, error detection, syndrome generation, burst error trapping, and ... | 04/22/1986 |
| 4584687 | Calibrated feedback for laser diodes Two thick film resistors calibrate the output of the feedback light detector circuit for monitoring the light power of a laser diode. The output is connected to the power control circuit for the laser diode. Calibration of the feedback output during manuf... | 04/22/1986 |
| 4580175 | Endless, folded magnetoresistive head A magnetic read head has a first embodiment comprising an elongated magnetoresistive element having a central region and distant ends. The central region has equipotential strips disposed intermediate to its ends, and detection circuitry is electrically c... | 04/01/1986 |
| 4571649 | Disk drive carriage structure A disk memory assembly has a carriage structure which has a coil assembly secured to one end and is supported by bearings for rectilinear movement in response to the energization of a voice coil. The carriage has four fins, a tower member and a horizontal... | 02/18/1986 |
| 4568881 | Phase comparator and data separator A phase comparator and data separator is disclosed capable of establishing a detection window of the order of 100 percent of the clock cycle at a data recovery rate at least as great as 100 MHz. One of the preferred embodiments of the invention comprises ... | 02/04/1986 |
| 4564585 | Process for fabricating negative pressure sliders A process for fabricating a negative pressure slider is disclosed which briefly comprises the steps of: (a) applying a dry negative photoresist layer to the surface of the slider; (b) positioning a mask having alignment marks which are too narrow to be re... | 01/14/1986 |
| 4560940 | Peak amplitude measurement Apparatus for measuring the peak amplitude of an input signal includes a comparator for comparing the input signal against a reference signal. The comparator selectively drives a latch which in turn drives a successive approximation register. The count in... | 12/24/1985 |
| 4560924 | Flatness measuring apparatus An elongated carriage has a first capacitive probe disposed from its top surface opposite to an object surface, and a second capacitive probe disposed from its bottom surface opposite to a level reference surface. An arm is orthogonally disposed from the ... | 12/24/1985 |
| 4559743 | Method for calibrating a machining sensor A method of calibrating an analog machining sensor of the varying resistance type which has been deposited on a surface involves depositing adjacent it with great positional accuracy relative to a feature on the surface, discrete machining sensors. As mac... | 12/24/1985 |
| 4551355 | High speed coating process for magnetic disks A disk is rotated at high speed on a spindle while fluid carrying magnetic medium material is applied to the disk through a dispensing nozzle which starts at the outside diameter of the disk and travels to the inside diameter, pauses momentarily, and then... | 11/05/1985 |
| 4546269 | Method and apparatus for optimally tuning clock signals for digital computers In a first searching mode of the control program for the microprocessor, the microprocessor starts with a selected clock input and associated delay circuit and sets the delay circuit to an initial clocking point which is intermediate to the minimum and ma... | 10/08/1985 |
| 4544890 | Flat coil velocity transducer A flat coil velocity transducer includes a thin, flat coil mounted to a member whose velocity is to be measured. The convolutions of the coil are skewed so that regions at opposite ends of the coil contain predominantly upper or lower legs of the convolut... | 10/01/1985 |
| 4541689 | Friction wedge alignment system for laser diode collimator pens A wedge/taper alignment ring is used to hold the objective lens of a laser light pen in place. The ring is free to move in the axial direction under forces of thermal expansion and shock, decreasing distortion and misalignment to the objective. Moreover, ... | 09/17/1985 |
| 4539835 | Calibration apparatus for capacitance height gauges In an electron beam lithography apparatus a capacitance height gauge is used to determine the distance between a reticule and electron optics. In order to calibrate the capacitance gauge an optical interferometer, including a mirror are mounted on the sam... | 09/10/1985 |
| 4536992 | Precision lapping system Apparatus for precisely machining the surface of a workpiece comprises a rotating plate with a flat, horizontal abrasive-laden surface against which the workpiece surface is forced by gravity. The workpiece is carried on the free end of an arm pivotably s... | 08/27/1985 |
| 4536740 | Doublet detector for data recording or transmission A data recovery circuit useful in magnetic data recording systems employs doublet pulses to at least partially encode data. Measurement of the slope of the transition between doublet pulse half-cycle peaks and of the amplitude of this transition allows re... | 08/20/1985 |
| 4536270 | Apparatus and method for shielding magnetic heads during a sputtering operation In the process for manufacturing the ferrite cores used in magnetic data transducer heads, a novel stacking of the bars from which the core pieces are cut allows these bars to mutually shield each other's back gap areas during the alumina sputtering step ... | 08/20/1985 |
| 4535375 | Magnetoresistive head A magnetic read head has a first embodiment comprising an elongated magnetoresistive element having a central region and distant ends. The central region has equipotential strips disposed intermediate to its ends, and detection circuitry is electrically c... | 08/13/1985 |
| 4535252 | Wind electric generation plant and system with improved alternator field excitation An improvement in a wind electric generation system of the type disclosed in Jacobs et al. U.S. Pat. Nos. 4,059,771, 4,228,361, and 4,228,362, with particular reference to U.S. Pat. No. 4,228,361. The improvement provides circuitry means for monitoring, c... | 08/13/1985 |
| 4530072 | Bubble memory bias field structure In a bubble memory package, a contoured, shaped magnet and filler plate combination is provided to shape the magnetic field in a uniform fashion to prevent the loss of magnetic flux density which normally tends to occur in the center of the magnet area of... | 07/16/1985 |
| 4527249 | Simulator system for logic design validation A hardware network or system is disclosed for testing LSI and VLSI logic device design and system design by simulation utilizing individual gate functions. The simulator system uses switching logic, random access memory, and a state table device to simula... | 07/02/1985 |
| 4526011 | Dew point sensitive computer cooling system A computer cooling system has a mixing valve which supplies coolant to the computer and receives hot return coolant from the computer and also chilled return coolant from a chiller intermediate the computer and the mixing valve. The mixing valve mixes the... | 07/02/1985 |
