Abstract: An automatic frequency control (AFC) circuit for a signal receiver having a tuner, intermediate frequency (IF) amplifier, video amplifier, and sync pulse separation means includes a discriminator coupled to the IF stage and a signal combining means coupled to the discriminator means and sync pulse separation means and to the tuner to effect a given "pull-in" range for the tuner in response to error signals from the discriminator and an increased "pull-in" range upon loss of sync signals from the sync pulse separation means when the tuner stage is increasingly detuned.

Abstract: There is disclosed a method for making tined electrical contacts from a continuous metal strip as the strip intermittently moves through a plurality of work stations. The method comprises the steps of advancing the metal strip; positioning a portion of contact material in alignment with an area on said strip, attaching said portion to said area, advancing the metal strip, and thereafter cutting and forming the strip to provide an electrical contact.

Abstract: A ceramic cellular structure having a cell density of up to 1600 cells per square inch and wall thicknesses down to 2 mils is produced by a process which comprises: 1) forming a slurry consisting essentially of finely divided sinterable solid particles of ceramic raw materials and a controlled amount of a plastic supporting matrix containing thermoplastic resin, a thermosetting resin, a plasticizer, an organic solvent and a small amount of a deflocculant; 2) ball milling the slurry; 3) casting the slurry in the form of a film; 4) removing the solvent to produce a selfsupporting green ceramic tape; 6) molding a portion of the tape to form a corrugated first member; 7) providing another portion of the tape to form a substantially flat second member; 8) forming a first bilayer by bonding the second member to the nodes of the first member; 9) mutually bonding a predetermined number of bilayers substantially identical to the first bilayer to form a cellular green structure of a desired shape; and 10) firing the gr

Abstract: A broadband amplifier with a negative feedback circuit having a variable resistance means and first and second parallel resistor-inductor combinations for slope control is shown. The variable resistance means establishes the overall frequency response and can be electronically varied to provide automatic gain control. The first and second parallel resistor-inductor combinations provide compensation for deviations from the desired frequency response over respective first and second frequency ranges.

Abstract: A process suitable for reclaiming europium-activated yttrium oxysulfide contaminated with europium-activated yttrium oxide and other non-rare earth cathodoluminescent phosphors comprises forming a relatively uniform admixture of specific fluxing agents, the contaminated yttrium oxysulfide phosphor, a sufficient amount of reactive rare earth source selected from reactive yttrium and europium sources to achieve a predetermined yttrium to europium ratio in the admixture and an excess of the theoretical amount of sulfur required to convert the yttrium oxide and the yttrium source to yttrium oxysulfide, heating the admixture at a temperature of at least 850.degree.

Abstract: Apparatus is disclosed for sensing and determining whether or not exactly a predetermined proper number (N) of lines, part of a larger number of lines (M) are being driven, i.e., an "N of M Detector." It includes resistances connected to each of the lines, and connected together at a common summing point juncture, whose voltage is proportional to the number of lines being driven. The summing point is sensed by two comparators ("greater than" and "less than") followed by Exclusive Or logic which can deliver a "Not Exactly N" error signal. Also disclosed therewith is a transistor crosspoint switching array circuit.

Abstract: A calcium tungstate X-ray phosphor is disclosed which consists essentially of a calcium tungstate host and from about 50 to about 200 parts per million, based upon the weight of the host, of vanadium as a dopant. The disclosed phosphor exhibits no detectable lag or persistence and is appreciably brighter than prior X-ray phosphors. A process for producing the phosphor is also disclosed which process comprises forming an aqueous reaction media of a water-soluble calcium source and a water-soluble tungstate source having an excess of calcium, maintaining a temperature of above about 80.degree.C for a time sufficient to form solid calcium tungstate having a stoichiometric excess of calcium, separating the solid calcium tungstate, adding from about 50 to 200 ppm of a vanadium source and a fluxing material, heating said calcium tungstate to a temperature of between about 700.degree.C and 1150.degree.

Abstract: In the formation of cylindrically shaped heat regenerators from ceramic honeycomb structures for use in gas turbine engines, a gas-impervious seal of the peripheral honeycomb cells and a high strength outer ring are formed simultaneously in an apparatus which provides for surrounding the outer wall of the honeycomb structure with a castable ceramic composition suitable for forming the outer ring, contacting a peripheral area of the upper surface of the honeycomb structure defining a predetermined number of peripheral cell openings with a (different) ceramic slurry composition, evacuating the honeycomb cells whose openings are contacted with the slurry composition through corresponding openings in the lower surface of the honeycomb structure in order to promote flow of the slurry into the evacuated cells, thereby forming a gas impervious seal of these peripheral cells, while simultaneously vibrating the honeycomb structure and castable composition in order to promote flow and intimate contact of the castable c

Abstract: An interface means for interconnecting a sequentially actuated apparatus and a computer to automatically maintain at a desired level a process variable of said apparatus. The interface means comprises first, second, and third actuation means adapted for actuating the apparatus or computer in accordance with one of the three output signals from the computer to achieve said desired level. A system is also described which automatically maintains a process variable of a sequentially actuated apparatus at a desired level.

Abstract: Ammonium tungstate, ammonium paratungstate, ammonium metatungstate or hydrated tungsten trioxide is produced by passing tungstate anions through an anion exchange membrane into an aqueous solution containing ammonium cations under the driving force of an electrical potential for a time sufficient to achieve a pH within the range in which the desired tungsten compound will form.

Abstract: Time compression scanner for monitoring telephone lines to detect supervisory tones. Eighty-eight lines are organized into eight groups of 11 lines each. The corresponding lines of each group are sampled simultaneously by a first arrangement of eight multiplexers. A second multiplexer repeatedly samples the eight samples from the first multiplexers. These analog samples are converted to digital samples and stored in a digital memory. The memory stores a set of samples pertaining to the incoming signals present on one line of each of the groups. When the first multiplexers each switch to the next line of each of the groups, the stored digital samples are read out of the memory. The samples are read out of the memory for each group in order, converted to analog signals, and passed through a low pass filter. The frequencies present in the resulting signal are speeded up by a factor of eight over the frequencies of any supervisory tones present in the incoming signal from which it was derived.

Abstract: A swivel base assembly for supporting a device such as a video display terminal (including a video monitor and a keyboard) and including means for rotating the device through a large angle, for example, 270.degree.. The swivel base assembly includes a tray on which the device is positioned and a circular base member having a space for containing a circularly- wound data-carrying cable, such as a coaxial cable, for use by the device on the tray. The base member also includes a pair of upstanding spaced stop members formed therein and arranged to cooperate with a depressed stop member formed in the tray to establish the aforementioned 270.degree. range of angular rotation.

Abstract: A frequency discriminator utilizing a pair of surface wave devices each comprising one transducer on a piezoelectric substrate connected in series with a signal source and a pair of envelope detectors connected in series with the surface wave devices is shown.

Abstract: Data storage and processing apparatus for storing and processing data for use by a video display monitor. The data storage and processing apparatus includes a random access memory having a general storage section arranged to store data including display character data to be displayed in horizontal display lines on the display surface of a video display monitor and control data for use in conserving storage space in the random access memory. The memory conservation control data contained in the general storage section of the random access memory includes coded three-character repeat sequences. Each coded repeat sequence specifies a repeat operation and a particular number of times that a display data character is to be repeated in a display line.

Abstract: An improved method is disclosed for controlling the snap-action characteristics of thermally expansive bimetallic members. The improvement comprises heating the bimetallic member during the forming operation which provides the member with said snap-acting characteristics to a temperature substantially greater than the upper temperature limit which defines said characteristics.

Abstract: Frequency discriminators utilizing a pair of surface wave devices each comprising one transducer on a piezoelectric substrate connected in parallel with a signal source and a pair of envelope detectors connected in parallel with the surface wave devices are shown.

Abstract: A high voltage switching generator for rapidly changing the voltage across a load capacitance. A first DC voltage source connected in series with non-linear device and switch units together with a second DC voltage source is connected across the load capacitance. Each non-linear device and switch unit includes a series of zener diodes providing a non-linear device having a threshold voltage equal to the sum of the threshold voltages of the individual diodes. During current flow therethrough the series of zener diodes has a voltage drop equal to its threshold voltage. Each non-linear device and switch unit includes a transistor by-pass switching arrangement which can be closed to short circuit the associated series of zener diodes so that there is no voltage drop thereacross. By selectively opening and closing the by-pass switching arrangements of the non-linear device and switch units the voltage across the load capacitance can be changed.

Abstract: A process for forming a color cathode ray tube screen structure, having means for enhancing the absorption of ambient light and providing improvement in the contrast of the image display involves the deposition of three superimposed substantially continuous window-defining layers of optical filter materials. The primary, secondary and tertiary filter layers have discretely disposed window areas formed therein to expose a pattern of filter areas representing the respective filter materials. The filter windows are of a shaping similar to that of the apertures in a spatially related pattern mask member. Each window exhibits a uniform periphery free of indentations, being so defined by a uniform opaque interstitial encompassment homogeneously made up of the three distinct layers of filter materials.

Abstract: An improvement is provided in a color cathode ray tube mask-panel assembly to assure positive electrical contact between the apertured mask member and the sidewall portion of the viewing panel. Resilient electrical contactor means positioned in the spacing between the mask member and the panel, is maintained in a flexed attitude with the attachment portion thereof affixed to the frame and an integral flexural contact portion so oriented to effect constant pressured contact with the conductively coated sidewall of the panel.

Abstract: An electronic ballast circuit for reducing the warm up time of high intensity discharge (HID) lamps wherein lamp current flow is abruptly reduced by a switching means responsive to load voltage variations upon attainment of power in an amount sufficient to activate the HID lamp.