Abstract: The invention contemplates remotely operable lifting mechanism for selectively displacing a liquid-level float in a sealed tank, to permit checking of the operational status of the float throughout its displaceable range, and to permit check-out of magnetically operated electrical means actuated by the float at a predetermined float level within its displaceable range. The lifting force is coupled magnetically to the float without interference with the path of float movement and without interference with the magnetically operated electrical means.

Abstract: The lines or stations of a multi-line office telephone system are sequentially examined to detect a hold tone signal of a specified frequency or frequencies on one or more of the lines. The lines are examined for increasingly longer time periods in accordance with the type of energy sensed at each line. If the line is not active or connected in a first brief period, the scanner then proceeds to examine the next line for a hold tone signal. If wide-band energy is not detected on the line in a second, longer period, the examination of the line is terminated and the scan process is continued to the next line. If wide-band energy above a threshold is detected on the line in a third, still longer period, the detected energy is further examined to determine whether this energy includes a valid hold tone signal. If a hold tone signal is detected on a line, the line is scanned again to detect the removal of the hold tone signal therefrom, whereupon a hold status is assigned to the line.

Abstract: A head rest for instruments used for opthamological examination comprises two vertical columns mounted on the instrument base. Each of said columns carries a vertical post to which is attached a forehead rest spanning the space between the posts. Said posts are retracted with respect to said columns. Said columns also carry a transverse bar spanning the space between the columns and supporting a chin rest which is adjustable with respect to the base. The arrangement provides maximum freedom of movement around the patient's eyes for the physician or surgeon.

Abstract: In a framed lead assembly for a semiconductor element, conductive lead strips comprising inward end portions for connection to electrode areas of the semiconductor element are supported to a frame by reinforcing strips of an insulating material made integral with at least center portions of the respective lead strips and a connection arrangement connecting the reinforcing strips with the frame. The connection arrangement may comprise those outward end regions of the respective reinforcing strips which are made integral with the frame of the insulating material and those outward end areas of the respective lead strips which are attached to the frame. The reinforcing strips may be connected together by bridge members of either the insulating material or another insulating material.

Abstract: An electric motor arrangement in which a modified induction motor is operated as a three-phase motor by connecting one of the input phases to the junction of the two motor windings, and by connecting the other two input phases to the other sides of the two motor windings. In one embodiment of the invention, one of the input phases is connected to the junction of the windings through a centrifugal switch. The induction motor may be a modified version of a permanent-split-capacitor type wherein the motor capacitor, conventionally connected across the free ends of the windings, is removed.

Abstract: Premixing apparatus includes a number of elongated interdigitated rotors and stators. At least some of the rotors and/or stators include a first longitudinal portion with a transverse axis oriented at a first angle with respect to the horizontal axis and a second longitudinal portion with a transverse axis which forms an acute angle with the transverse axis of the first portion.

Abstract: A method and coating material are provided for improving the wear and abrasion resistance of a composite nickel-base hard facing alloy applied to metal substrates comprising the system Ni-Cr-Si-B having dispersed therein particles comprising tungsten carbide, the improvement residing in controlling the average particle size of tungsten carbide to below 10 microns, e.g. 0.1 to 10 microns, preferably an average size ranging from about 2 to 8 microns (such as 2 to 6 microns), at an average interparticle spacing of less than 15 microns, and preferably less than 10 microns, e.g. up to 5 microns, the hard facing coating produced being further characterized in that the coating exhibits metallographically a substantially uniform structure at the surface thereof with respect to said tungsten carbide particles.

Abstract: A constant voltage circuit comprises an IGFET for deriving an output voltage for a load from a power supply and an inverter circuit responsive to the output voltage for controlling the IGFET in a negative feedback manner to stabilize the output voltage against fluctuations in the supply voltage and the load. The IGFET may be a depletion or an enhancement MOSFET. The inverter circuit preferably comprises an enhancement and a depletion or an enhancement MOSFET. Either a resistor or another IGFET may be connected between the inverter circuit and ground. The constant voltage circuit is readily manufactured as an IC together with an IGFET circuit used as the load.

Abstract: The invention contemplates pressure-fluid operated control connections, auxiliary to a trailer-hitch connection, for providing a selected one of a plurality of functions primarily to aid in making a hitched connection between a trailer and a towing vehicle. The invention also provides selective availability of safety aids for back-up maneuvering of the hitched trailer, and anti-sway coupling for the safe trailing of hitched vehicles on the highway. Various embodiments are described.

Abstract: Improved door activating motor control apparatus employs a self latching safety edge relay which is selectively energized by any of "open", one-button universal or obstruction-sensing safety edge contacts. A motor controlling contactor switch has its "open" direction coil and contact portion operated by safety edge relay contacts, and its "close" relay portion operated under control of a "close" or the one-button switch.The composite control apparatus of the instant invention exhibits significant operational advantages over prior art structures including, inter alia, frequency exercise of safety edge relay contacts, responsiveness to the "open" switch in an emergency situation, and retention of an obstruction sensing signal to cause door opening.

Abstract: A semiconductor solar cell capable of converting incident radiation to electrical energy at high efficiency includes a plurality of series-connected unit solar cells formed on a common wafer of semiconductor material. The unit solar cells each include a semiconductor substrate of one conductivity type and a p-n junction formed in the substrate. The light-receiving surface of the cell may have an opaque member thereon, and incident light may be directed onto the portion of that surface not covered by the opaque member. Various embodiments and methods illustrate the invention.

Abstract: A memory circuit arrangement employing one-transistor-per-bit memory cells in which differential sense amplifiers are utilized for detecting the state of the stored bits. First and second digit lines are arranged substantially parallel to and adjacent to each other and first and second parallel word lines are arranged substantially at right angles to the digit lines. Memory cells are connected at each cross point between the digit lines and the word lines.

Abstract: A mechanism for conversion between rotary and linear motion includes a rotatable roller carriage having a channel through which a shaft is passed axially. Shaft engaging drive rollers that are orbitally movable about the channel with the rotation of the roller carriage are positioned along the channel forming an acute angle therewith. Retaining rollers are held by the roller carriage parallel to the drive rollers to retain the drive rollers in a shaft engaging position. The drive rollers are driven by the retaining rollers in a rotary fashion to linearly advance the shaft.

Abstract: A hermetically sealed opto-electrical semiconductor device includes an opto-electrical semiconductor element centrally disposed in an envelope having at least two openings through which light beams are to pass, with flat plates made of a transparent material hermetically covering the respective openings perpendicularly to the directions of the light beams.

Abstract: The invention contemplates elastomeric-seal application to the so-called plain-spherical variety of self-aligning bearing wherein the outer ring is the product of a swaging operation which causes it to conform its cylindrical bore to a spherical surface at sliding interface with the spherical convex outer surface of an inner-bearing member. Specifically, in the machining of the swaged ring to its ultimate O.D. and other specified dimensions, a deformable axially extending lip is created, in conjunction with an undercut counterbore, at the axial end to be sealed; an elastomeric O-ring is fitted to the counterbore, and the lip is coined-over into retaining and preloading relation with the O-ring.

Abstract: An improved solar cell designed for optimum efficiency is comprised of a plurality of series connected unit solar cells formed from a common substrate of semiconductor material. Each unit solar cell has spaced elongate sidewalls, and a "dead space" area between adjoining sidewalls of adjacent units is made substantially smaller than an active, light receiving area, extending between the opposite sidewalls of each individual unit. In addition, the width of the active area is concisely limited to ensure that radiation incident on the active area is incident at a point which is spaced from the p-n junction of each unit by no more than a predetermined optimum distance. Reducing the "dead space" area while concisely limiting the width of the active area provides improved solar cell performance without requiring focusing lenses.

Abstract: In a method for fabricating a semiconductor device, a polycrystalline film deposited on a main surface of a substrate is subjected to selective oxidation to form polycrystalline silicon electrode wiring paths separated by silicon oxide. An impurity of a conductivity type opposite to that of the substrate is introduced through at least one of the wiring paths into the substrate. Also disclosed is a novel semiconductor device fabricated according to this process which has a reduced junction area and a shortened junction-to-electrode distance.

Abstract: The invention contemplates an automatic selectively programmable machine for making chains having links of different size in interlaced and connected assembly. By programming, the size and interlaced combination of different links can be selected to produce a wide variety of chain patterns.

Abstract: A two-dimensional charge-coupled device for relatively high resolution image pick up includes an imaging area, a storage area, and plural output registers for developing plural video signals delayed by predetermined intervals, e.g., integral multiples of one horizontal line trace period. The several register output signals are combined to provide a composite video signal characterized by a greater resolution vis-a-vis the direct CCD output.

Abstract: A semiconductor laser device includes a narrow elongated semiconductor region of the same conductivity type as another semiconductor region lying in the vicinity of the active region of the laser device. The elongated region extends in depth from the surface of the device to the vicinity of the active region. A surface semiconductor layer of an opposite conductivity type covers the entire surface of the device except for the elongated region.