Abstract: A vertical recording head includes a W-shaped core, a substrate carrying a thin film probe supported in one slot of the core, and a shield coil wound in the slots to hold the substrate and assemblage together. A non-magnetic cap forms the surface of the head over the cap, with the arrangement being such that the probe extends through the cap so the magnetic gap is as small as possible.

Abstract: A fan is disclosed that contains cut-outs that reduce the noise levels. The fan is used to cool circuit boards.

Abstract: A circuit means for detecting data errors in VLSI processing circuits at the earliest point such an error occurs in the processing stream or (in different modes) at any selected point therein, and for providing the prior operands and faulty (intermediate) output data together with an indication of what is wrong with the data. Described are registers and/or means for controlling the mode of the circuitry, error detection means (being, for example, parity check circuits), and an output means for providing the output in an organized way responsive to the controlling means and the output of the error detecton means. The method of using such a circuit is inherent in the disclosure.

Abstract: A coating composition is provided. The coating composition is a curable blend of ethylenically unsaturated polyester and ethylenically unsaturated thermoplastic polymers. The composition is capable of providing a thermoplastic, soluble, sandable, intermediate-stage coating and, when cured, a final stage coating which is unaffected by acetone placed on the final stage coating for two hours at 22.degree. C., has a percent haze value of 15% or less, and is unaffected when subjected to a Wet Print Test.

Abstract: A passive imaging system (400) includes a frequency scanning array (412) for receiving radiation emissions from a scene with a flat or known spectrum of emissions over the operating frequency of the array. Different beam directions are addressed by a spectrum analyzer (404). An image coordinate generator (410) may be used where necessary to normalize the image which may be stored or displayed by an appropriate device (406).In one embodiment, the array is planar so as to generate pencil beams. The planar array comprises parallel line-source antenna elements (402), with a common feed (414). The feed has a large "wrap-up" so that frequency-frequency scanning is employed.Alternatively, one-dimensional images can be effected with a single line-source frequency scanning antenna element. Also, one-dimensional frequency scanning may be supplemented by a different scanning approach for resolution orthogonal to that provided by the frequency scanning. In one embodiment, phase gradient scanning is employed.

Abstract: A phase shifter for microwave electromagnetic energy propagating through a waveguide has a composite structure of a series of capacitive phase shifting posts positioned within the waveguide diametrically across from a symmetrically tapered ridge. The series of posts introduce a nominal value of phase shift with an incremental value which increases with increasing frequency of the electromagnetic energy. The tapered ridge introduces a nominal value of phase shift plus an incremental value which decreases with increasing frequency of the electromagnetic energy. The rates of increase and decrease of the incremental values of phase shift cancel so as to provide a resultant phase shift which is substantially invariant with frequency.

Abstract: An analog radio frequency spectrum analyzer (10) includes a calibration section (30) for compensating distortions. The spectrum analyzer includes a first reflective array compressor or "RAC" (12), a frequency sweep section (20), and a second RAC (14). Frequency domain compensations introduced at the signal input by the calibration section compensate distortions in the time domain at the output of the spectrum analyzer. This system corrects, for example, nonlinearities in the second RAC. The calibration function is determined by a network analysis of the spectrum analyzer and is specific to the RAC included. The function is stored in a ROM or other memory as a sequence of complex digital words. An address generator (36) directs the words to a complex multiplier (32) so that each input symbol period is multiplied by the sequence. Each complex digital word corresponds to an amplitude and phase modulation of the incoming signal over a fraction of a symbol period.

Abstract: A method for polling headphones of a passive tv audience meter system. Tv audience members wear headphones by which they may receive the audio portion of the tv programs. The headphones are enabled to receive the audio for a short time by periodic polls transmitted by a tv audience meter. The headphones in turn acknowledge to the polls to indicate to the meter which members of the audience are watching tv. The method uses short and long period polls in conjunction with a timer whose period is shorter than the long period poll. The long period poll permits activation of headphone but also prevents adequate audio reception until the headphone acknowledges the poll. The short period poll is entered in response to the receipt of an acknowledgement and permits uninterrupted audio.

Abstract: A sorbent sheet product, particularly useful for disposal diapers, incontinent devices, and sanitary napkins, is provided. The sorbent sheet product comprises a coherent fibrous web that includes entangled blown polymeric fibers and high sorbency, liquid sorbent fibers intermingled with the blown polymeric fibers. The sorbent sheet product may also contain liquid transport fibers.

Abstract: An improved rotary read/write head assembly is particularly suitable for use with a vertical format magnetic recording medium such as tape in a magnetic recording system. A rotary element of the assembly carries a plurality of main poles whose tips are at an edge of the rotary element and kept in substantially contacting relationship with the medium. Rotation of the element causes the pole tips to successively sweep across the medium and sequentially function as the main pole of a probe head.

Abstract: A read channel for an optical recorder. Data is recorded on the media in a fixed block code. The data is read and the location of the holes within a symbol are determined for the odd and even symbol positions separately. The location of the hole is determined for an odd or an even hole by using two sample and hold cells to hold the signal value received at a symbol position and compare it to the signal value received at a previous position. If the comparison results in a new higher valued signal being found, the output of the comparator changes. If the output of the comparator changes, the address of the change is recorded. The last such change denotes the location of the symbol position having the highest signal value, which is the address of the hole. The address of the holes, even and odd, are used to directly convert from the fixed block code to binary. Two symbols convert to 8 binary bits.

Abstract: A backup material for small bore drilling in hard crystalline materials, such as multilayer circuit boards containing polyimide/glass, polyimide kevlar or modified epoxy BT/glass, includes at least one layer of hard crystalline material. Standard LCOA material with an additional layer selected from the group comprising polyimides, fluorocarbons and high temperature polycarbonates has proven successful.

Abstract: A process for chemically bonding a lubricant to a magnetic disk by applying a functionalized polymeric lubricant to the disk, heating it until a significant portion bonds to the disk via the functional terminal group, and then reacting the unbonded residue with a chemical moiety, the residue then forming a mobile lubricant highly resistant to spin-off due to the presence of the bonded lubricant.

Abstract: A method of sealing electrical fittings is provided. The method comprises foaming in situ a removable, flame retardant, solvent resistant, substantially closed cell isocyanurate foam. The isocyanurate foam is prepared from a two-part, liquid, foamable, curable composition, the parts being mixed at the time of application, the composition comprising, in a first part, a prereaction product of an isocyanate and a polyol, and, in a second part, catalyst, chain extending agent, flame retardant agent, and blowing agent. Also provided are an electrical fitting and cable duct or riser sealed with the isocyanurate foam.

Abstract: The present invention is a method and apparatus for injecting compressible fluids into multiple zones of a hydrocarbon bearing formation, in particular injecting compressible fluid at a predetermined, constant rate into multiple zones through a single tubing string. Producing zones are packed off and limited entry outlets are installed on the injection tubing string at each producing zone. Injection pressure is maintained and limited entry outlets are designed and sized such that the compressible fluid reaches sonic flow through the outlets so that the flow rate no longer responds to changes in downstream pressures.

Abstract: A solder/desolder tool has a heater block supporting a handle at its upper end and a heating plate at its lower end. The heating plate is thermally engaged by heating elements housed in the heater block. An array of pin relief apertures are formed in the heating plate. Retractable clamps are pivoted to the heater block for clamping a leadless chip against the heating plate. The leadless chip has an array of input/output sockets corresponding to the array of pin relief apertures. A method is disclosed for soldering the chip sockets to a corresponding array of pins supported by a PC board. According to the method, solder balls are loaded in the chip sockets, and the chip is then secured in the tool to reflow the solder balls to form solder plugs. The solder plugs are then set upon the upper ends of the pins and melted by the heating plate so that solder joints are formed between the pins and sockets. The chip is released from the tool to allow the solder joints to cool.

Abstract: An improved rotary read/write head assembly is particularly suitable for use with a vertical format magnetic recording medium such as tape in a magnetic recording system. A rotary element of the assembly carries a plurality of main poles whose tips are at an edge of the rotary element and kept in substantially contacting relationship with the medium. Rotation of the element causes the pole tips to successively sweep across the medium and sequentially function as the main pole of a probe head.

Abstract: An adaptive antenna 10 embodying the present invention includes an array of sensors 12. Each sensor 12 has associated therewith a main channel 14, a feedthrough path 16 and a feedback path 18. Correlators 20 coprocess signals in the feedthrough path 16 and the feedback path 18; the result is transformed according to an algorithm by a computer 22 which controls a weighting circuit 24. The weighting circuit 24 thus progressively modifies the signal in the main channel 14 to minimize interference with a desired signal. Placement of a limiter 26 along the feedback path 18 simplifies correlator design relative to adaptive antennas without such limiters and improves performance relative to adaptive antennas with limiters in the feedthrough path.

Abstract: A thermal insulating fabric is described. The fabric is a stitch-bonded, fibrous, nonwoven web of microfibers that average about 10 micrometers or less in diameter.

Abstract: An adapter for metering tv viewing in homes having video cassette recorders ("VCR's"). The adapter disables antenna (cable) input to the VCR except when in the record mode. Record mode is detected by a probe which detects the 70 MHz erase signal of the erase heads. When in record mode, antenna input to the VCR is enabled and a tv meter determines channel tuning. A bandpass filter on the VCR video output restricts the tv's ability to tube channels other than the VCR output. If the tv is tuned to the VCR output channel, the viewer is monitoring the program being recorded or watching a prerecorded tape. Otherwise, he is tuning through the normal antenna (cable) input and a meter determines the tv's channel tuning.