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| Number | Title | Issue Date |
| 4750058 | Gain control circuitry for readback apparatus in a PRML magnetic recording system In the readback apparatus of magnetic recording system operating in accordance with the partial-response maximum-likelihood (PRML) technique, a variable-gain amplifier (VGA) and a maximum-likelihood sequence detector (ML DET) plus a gain control loop are ... | 06/07/1988 |
| 4594555 | Frequency selective sampling detector A signal receiver having a frequency selective sampling detector which accepts a bandlimited analog signal and outputs uniformly spaced, digital samples of the signal's quadrature and in-phase components. The center frequency, phase reference and sample i... | 06/10/1986 |
| 4577503 | Method and device for detecting a specific acoustic spectral feature A method and device for detecting a narrow acoustic spectral feature in a sample as described. The method uses an electrical frequency modulated (FM) signal that is obtained from a voltage controlled oscillator. The Fourier spectrum of this wave is a main... | 03/25/1986 |
| 4566022 | Flexible/compressed array macro design A transistor array arrangement for providing high-density semiconductor logic circuits in double polysilicon technology is described. Semiconductor, for example, FET, logic circuits have four independent but simultaneously accessible FET devices which are... | 01/21/1986 |
| 4544900 | Polarized signal receiver system A rotatable polarized signal receiver, having a rectangular waveguide orthogonally coupled to a circular waveguide, has a receiver probe portion oriented in the circular waveguide and a signal launch probe portion extending into the rectangular waveguide.... | 10/01/1985 |
| 4513298 | Thermal ink jet printhead A protective passivation structure is provided for a thermal ink jet printing head which employs a resistive heating element formed of phosphorus-diffused silicon. The passivation structure includes a layer of silicon nitride over the heating element with... | 04/23/1985 |
| 4504779 | Electrical load drive and control system A circuit for varying the power supplied from a D.C. power supply to a moderate to high powered load such as a motor is disclosed. Trapezoidal voltage and current waveforms are used approaching the maximum load power delivery available from sine wave driv... | 03/12/1985 |
| 4467374 | Method and means for direct-current polarity restoration in magnetic recording A method and means is disclosed for restoring the direct-current component of a signal read from a storage medium in the form of isolated analog signals which are simultaneously applied to a differentiator and a binary signal generator. The positive pulse... | 08/21/1984 |
| 4455655 | Real time fault tolerant error correction mechanism The present invention provides a real-time fault-tolerant hardware error correction device which is typically implemented as a data transfer circuit between a disc memory and a processing unit. It operates in two modes: as an encoding system and error det... | 06/19/1984 |
| 4411212 | Apparatus for reducing roll and pitch motions of floating vessels Apparatus for substantially reducing the roll and pitch motions of a floating vessel in commonly occurring seas is described. The apparatus comprises a recessed cavity formed in a substantial area on the bottom of the hull of the vessel and has an airblow... | 10/25/1983 |
| 4380014 | Feed horn for reflector antennae An improved feed horn for use with long f/D reflector antennae comprising an aperture having a plurality of protuberances orthogonally disposed around the periphery thereof, a conical section, a waveguide transition section and an impedance matching secti... | 04/12/1983 |
| 4366766 | System for stabilizing a floating vessel A seagoing vessel is stabilized by a passive system including tanks symmetrically disposed on the vessel below the water line. The tanks are connected by a conduit and pressurized with air to a selected pressure level. During each oscillatory roll and/or ... | 01/04/1983 |
| 3986186 | Automatic display segment intensity control This specification describes a power control circuit for reducing the brightness of multi-segment light-emitting diode (LED) characters in proportion to the number of segments illuminated to compensate for the apparent greater brightness of those characte... | 10/12/1976 |
| 3973110 | Circulating shift register time-keeping circuit The circulating shift register time-keeping circuit of the present invention comprises five circulating shift registers and controller and time base circuits to provide real-time, stopwatch, date and alarm functions to an eight-digit display means via a d... | 08/03/1976 |
| 3973106 | Thin film thermal print head The thermal print head disclosed herein comprises resistive heating elements deposited on mesas of glass glaze over an aluminum oxide substrate for more efficient marking of thermally sensitive recording material. After the mesas are formed in the glass g... | 08/03/1976 |
| 3955074 | General purpose calculator having keys with more than one function assigned thereto A battery-powered, hand-held calculator employs MOS/LSI calculator circuits to perform arithmetic and financial calculations. Data and commands are input to the calculator from a keyboard having a prefix key to double the functions of selected keys. A 15-... | 05/04/1976 |
| 3946302 | Power regulator with R.M.S. output voltage as function of unregulated D.C. Utilizing the method and circuit described herein regulated power is provided by controlling the duty cycle of p. fixed frequency signal as a function of the amplitude of unregulated D.C. voltage applied. A thin film thermal printer utilizing this power r... | 03/23/1976 |
| 3946218 | General purpose calculator with capability for performing yield-to-maturity of a bond calculation A battery-powered, hand-held, calculator employs MOS/LSI calculator circuits to perform arithmetic and financial calculations. Data and commands are input to the calculator from a keyboard having shift key to double the functions of selected keys. A 15-di... | 03/23/1976 |
| 3934695 | Method and apparatus for enhancing and maintaining character quality in thermal printers The quality of thermally printed characters is enhanced by controlling the time at which and the time for which power is applied to the resistive printing elements in a battery-operated moving-head thermal dot matrix printer. By sequentially strobing the ... | 01/27/1976 |
