Abstract: A magneto optical thin film recording medium is disclosed having very high carrier-to-noise ratios and high rotation angles. A transmission electron microscope photomicrograph (at 200,000.times.) of one such medium is shown in FIG. 1. These are multi-phase amorphous materials having magnetic anisotropy perpendicular to the plane of the thin film. They are produced in a triode vacuum sputtering process at vacuums in the range of 4.times.10.sup.-3 to 6.times.10.sup.-4 Torr. By adjusting process parameters such as substrate temperature, anode bias and deposition rate, the properties of the thin film can be altered.

Abstract: A coaxial phase shifter for shifting the phase of a signal being transmitted along a transverse electromagnetic transmission line. The phase shifter is in line with the transmission line's inner conductor, such that it is very compact and such that the transmission line's outer conductor need not be modified. The phase shifter includes electrically-conductive fingers arranged in spaced, confronting relationship with each other, to capacitively couple the signal from one segment of the transmission line's inner conductor to another. In addition, the phase shifter is configured to provide an input impedance at both of its ends that matches the characteristic impedance of the transmission line.

Abstract: Preparation of dialkyl oxalates by the oxidative carbonylation of alcohols which comprises reacting carbon monoxide with an alcohol in the presence of a catalytic amount of a catalyst comprising palladium in complex combination with a ligand and in the presence of a stoichiometric amount of a quinone. Advantageously, carboxylic acid cocatalysts may be employed in addition to the palladium-containing catalyst.

Abstract: A channel identifying rolling bar code, transmitted with a television broadcast signal, is displayed at a selected location on the receiving television screen. An apparatus is secured to the television set to view the rolling bar code to identify the channel being transmitted and process that information as necessary to detect the periods of time that different channels are received by the particular set. That information is stored in an internal memory for eventual use by a central processor.

Abstract: In an EEPROM memory cell of the kind which relies on tunneling action through a thin oxide layer to store charge on a floating gate, the floating gate and the channel regions of the memory cell are provided with additional doping of the same kind as in the substrate in order to raise the virgin state threshold voltage of the memory cell to a high positive value, such as 4 volts. Additionally, the overlap area between the control gate and the floating gate is reduced to the extent that the capacitance between the floating gate and the control gate is substantially equal to the capacitance between the floating gate and the substrate during programming, but the effective capacitance between the floating gate and the substrate is greatly reduced during erase mode. As a result, little or no tunneling occurs during programming and the threshold voltage level is the same as the virgin threshold value of the memory cell.

Abstract: Fluorochemical allophanates containing one or more monovalent fluoroaliphatic radicals having at least three fully fluorinated terminal carbon atoms and one or more allophanate moieties, the radicals and moieties bonded together by hetero atom-containing or organic linking groups are provided. These fluorochemical allophanates are useful in the form of aqueous dispersions or emulsions or organic solutions in the treatment of fibrous substrates, such as textile fibers, to impart oil and water repellency.

Abstract: This invention relates to the field of degaussing devices and has particular applicability to such devices which are used to remove magnetic bias from digital recording heads in mass storage devices. It provides for a device which employs a microcontroller integrated circuit capable of hardware multiply and a digital to analog converter to produce a decaying sinewave signal. The rest of the general requirements for a functional degauss circuit are generally shown. The height and frequency of this sinewave signal can be modified under software control using this invention.

Abstract: Disclosed is an apparatus for detection of write protect data written on an optical disk by simultaneously reading the data during writing using differential detection and disabling further writing if write protect data is present. The write protect data is the same format as other data written on the optical disk and is written as the first byte of data on all data fields. The data is written in a fixed-block format defining a symbol having a predetermined number of symbol positions and a predetermined number of holes which may be written at the symbol positions, an equal number of holes at odd and at even positions. The write protect symbol has holes written at symbol position numbers two and five. During the writing of a write protect symbol, the laser is operated at read power before it is operated at write power and a signal associated with the hole associated power of the reflected beam is sampled at position number eight of the previous symbol and at position number one of the write protect symbol.

Abstract: A magnetic recording medium has a biaxially-oriented polyester film base which includes carbon black beads having a median diameter from 50 to 500 nm and is substantially free from beads or agglomerates more than 5 micrometers in diameter. The beads provide opacity such as is often required of the flexible recording disk of a diskette. The film base may be either a single layer, throughout which the beads are uniformly dispersed, or it may be multi-layer, e.g., a central layer containing the carbon black beads and two surface layers which are free from the beads.

Abstract: This invention relates to a non-intumescent, non-char forming, endothermic, essentially inorganic, flexible, fire-protective sheet material. The flexible sheet is made of a composition comprising:(a) an inorganic fiber, such as fiberglass and alumino-silicate refractory fibers;(b) an organic polymer binder, such as an acrylic resin; and(c) an inorganic endothermic filler, such as alumina trihydrate.The weight ratio of organic to inorganic constituents is less than about 0.10, and the weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) is in the range of about 0.5 to 50. This sheet is a useful fire barrier wrap for conduits and cable trays in building construction, which provides excellent fire protection, and the current capacity derating of cables is significantly less with this new fibrous sheet than it is in the case of known fire barrier sheet materials.

Abstract: A roll of pressure-sensitive adhesive tape, the adhesive layer of which is an alkyl acrylate polymer which is low-tack and yet sufficiently tacky to adhere reliably to ordinary substrates but, by virtue of being crosslinked and nearly free from polar substituents, it is readily peelable from those substrates after prolonged dwell.

Abstract: An FET double boosted clock driver for producing a clock signal having an amplitude greater than the drain supply voltage. The clock output of a second clock driver is capacitively coupled to the clock output of a first clock driver. The second clock driver boosts the voltage on the source of an enhancement mode (output) FET of the first clock driver. The output FET has its gate connected to a bootstrapped node and its drain connected to a drain voltage source (VDD). A depletion mode FET forms a feedback path between the source of the output node FET and the bootstrapped node. When the bootstrapped node is bootstrapped to VDD+VT, the output FET precharges the clock output to VDD. When the potential of the clock output approaches VDD, the depletion mode FET discharges the bootstrapped node to an input clock.

Abstract: Disclosed is an apparatus for verifying data written on an optical disk by simultaneously reading the data during writing and using differential detection to verify that the data has been written correctly. The data is written in a fixed-block format defining a symbol having a predetermined number of symbol positions and a predetermined number of holes which may be written in the symbol positions, an equal number of holes in the odd positions and in the even positions. In this regard, the holes written in the odd positions are independently verified from the holes written in the even positions. Immediately after the laser has been operated at write power, it is returned to read power and a signal associated with the hole associated power of the reflected beam is sampled. This signal is compared to the signal power generated at the previous even or odd position. The highest signal is retained and compared to the next even or odd position's signal.

Abstract: 3-(N-butyryl or valeryl-N-arylamino)-gamma-butyrolactones and their thio analogs. These compounds are useful as fungicides.

Abstract: A cold-cathode, plasma discharge modulator switch is disclosed. A crossed-field discharge plasma supplied charge carriers for the switch. A dc magnetic field is employed to provide a highly localized cusp magnetic field near the cathode, so that gas ionization occurs primarily in the cathode-source grid gap. The region between the cathode and anode is filled with a relatively low pressure gas. A highly transparent control grid with small apertures is closely spaced from the anode. The switch is closed through application of positive potential (relative to the plasma) to the control grid, and opened through application of negative potential relative to the plasma to the control grid. The application of negative potential to the control grid creates an ion sheath around the control grid which permits plasma cut-off to the anode region provided the sheath size is larger than the control grid aperture radius.

Abstract: An improved lubricant system for magnetic recording media such as helical scan video tapes is disclosed. The resulting improved magnetic recording media comprise the usual flexible or rigid backing and a magnetizable layer on the backing, but the lubricant is comprised of an organic compound selected from the group consisting of isomeric carboxylic acids and isomeric alcohols (e.g. iso-stearic acid and iso-stearyl alcohol). A fatty acid ester may be included in the lubricant.A typical composition utilizes 0.5 parts by weight iso-stearic acid per 100 parts of magnetizable material (e.g., cobalt doped ferric oxide particles) and 1 part by weight of isopropyl palmitate per 100 parts of the magnetizable material. Video tapes lubricated with this new system, have shown improved electromagnetic output (e.g., higher signal-to-noise ratios). In addition, they are able to withstand the stop motion of a helical scan video head better than prior known lubricant systems.

Abstract: A circuit is shown for rapidly enabling and disabling a high current laser diode through a coaxial cable responsive to a data signal received at the circuit input. At the circuit input are two switching transistors, one or the other of which is forward biased while its counterpart is reverse biased, depending upon the level of the incoming data signal. The output of one of the switching transistors is fed to the base inputs of two emitter follower transistors, one PNP and the other NPN. The emitter terminals of the follower transistors are connected to the gate terminal of an enhancement mode VMOS field effect transistor. When the VMOS FET is enabled, current flows in the laser diode to energize it. The voltage level at the input to the follower transistors determines the voltage to the gate input of the FET. When the incoming data signal is low, the gate-to-source potential difference is near zero, thus preventing the FET from conducting current.

Abstract: A linerless double-coated pressure-sensitive adhesive tape of the prior art is wound directly upon itself into a roll that can later be unwound without delamination or offsetting of adhesive. The novel tape differs from the prior tape in that the pressure-sensitive adhesive at each of its faces is a substantially solvent-free, crosslinked alkyl acrylate polymer and can be aggressively tacky for uses requiring high-performance adhesion.