Abstract: This electrical conduit end seal includes a cylindrical walled member having an opening at one end dimensioned to receive the conduit. The end opening terminates in a first partition having at least one aperture through which a cable in the conduit may pass in a friction fit. A second partition is parallel to and spaced apart from the first partition and has at least one corresponding aperture through which the cable may pass in a friction fit. The first and second partitions form, together with the cylinder wall, a sealing chamber. The sealing chamber has first and second openings communicating from the chamber to the exterior of the end seal. In use, the end seal is fastened to the conduit with the cable extending through the partition apertures. A caulking gun or other suitable dispenser is used to inject a curable resinous material or other sealing material through one of the chamber openings. The other chamber opening allows escape of air while the material is filling the chamber.

Abstract: This electronic scoring device allows scores for different players of a game to be kept and shown on separate displays. The device, preferably in hand-held form, has a plurality of score entry keys and a plurality of function keys. First and second display means of the device are assignable to opposing sides of a game. Circuit means is connected to the score entry keys, the function keys, and the display means to receive score information, carry out functions on the score information and display a resulting score on one of the displays for which the score information is entered. The device preferably operates under control of a suitable program incorporating scoring rules for a particular game being played. Game information is then entered by the keyboard, the resulting numerical score computed by the device, shown on the appropriate display, and entered into memory for the final game score.

Abstract: This apparatus for etching designs in a substrate, such as a glass door or window, has a transparent casing having an opening to be positioned against the substrate. A manually directable sandblasting nozzle is positioned inside the casing. A device is also provided for delivering a stream of compressed air containing sandblasting grit particles to the nozzle. The transparent casing is designed to be hand-held. In use, the substrate is masked except where the pattern is to be etched, and the transparent casing is positioned against the substrate. Sandblasting in the area of the substrate covered by the casing is carried out, and the casing moved to remaining areas of the substrate for further sandblasting until the complete design is formed in the substrate. This apparatus allows attractive designs to be formed in glass doors and windows without removing the glass from its installation.

Abstract: A portable battery-powered audio cable tester having two jacks for connecting with the cable to be tested. A signal light and push-button "short" switch are connected with the battery such that the light will go on when a cable not having a "short" is connected to the tester and off when the "short" switch is opened, indicating such absence of a short. A second push-button "check" switch is connected across the jacks such that the tester can be checked when a malfunctioning cable is connected and the signal light fails to operate. A three position toggle switch, for indicating whether the malfunction is due to a broken conductor or an open shield, is connected so as to alternately bypass the conductor and ground wires, following release of the "check" switch. The normally open toggle switch is flipped upwardly or downwardly, such that the signal light will flash at one of the two readings, i.e., broken conductor or open shield.

Abstract: An electrical circuit module easily assembled by hand and especially adapted for use in a circuit package for a model includes an insulator substrate with an upper surface and a plurality of apertures extending through the substrate from the upper surface. A plurality of circuit components on the upper surface of the insulator substrate have leads extending into the apertures. A conductive eyelet extends into each aperture and is dimensioned to form a friction fit with the leads of the components and any additional connecting wires in each aperture. The circuit module may then be mounted in a base including a control panel for an electrical circuit including the module on the base. Light, sound and similar effects are generated by the circuit for a model mounted on the base.

Abstract: An element of an integrated circuit, such as an ion implanted region or a metal layer, may be laser trimmed without exposing P-N junctions or other circuit elements not to be trimmed to damage by the laser through use of the present protection process and structure. In the process, an oxide through which the laser trimming is carried out is formed over a selected portion of the circuit to be trimmed by the laser. A bare layer of a metal reflective to the laser radiant energy beam, such as aluminum, gold or silver, is formed surrounding the selected portion of the circuit. The selected portion of the integrated circuit is then trimmed with the laser. The oxide promotes trimming in the selected area by absorbing the laser radiant energy beam. The bare metal layer protects the portion of the integrated circuit underlying it by reflecting most of its energy.

Abstract: This liquid clock has a lower liquid reservoir and an upper-liquid reservoir connected by an overflow to the lower reservoir. A plurality of timekeeping reservoirs are positioned to allow liquid in them to stand at the same level as in the upper reservoir. Each of the timekeeping reservoirs has a liquid exit orifice which connects to one of a plurality of timekeeping tubes, each having timekeeping related indicia on it. A means is provided for dropping a liquid displacement member in each of the timekeeping reservoirs at predetermined time intervals, thus displacing liquid into the timekeeping tubes. A means for withdrawing the liquid displacement members from the timekeeping reservoirs does so between the predetermined time intervals. A pump supplies liquid to the upper reservoir from the lower liquid reservoir to maintain the level of liquid in the upper reservoir at the level of the overflow. Means is further provided for periodically emptying the timekeeping tubes at time related intervals.

Abstract: These circuits produce light, sound and similar effects in models or toys by taking advantage of current modulation produced in a commutator circuit of a two-pole motor which may be used to provide motion for at least a part of the model or toy incorporating one of the circuits. At least one additional effect-producing circuit element in addition to the motor is electrically connected to the commutator circuit. A battery or other means for applying sufficient electromotive force to the commutator for operation of the motor is electrically connected to the commutator circuit. When the additional effect-producing element is parallel to the commutator circuit, the battery supplies an insufficient amount of electromotive force to allow both the motor and the additional effect-producing circuit element to operate in their maximum current-drawing condition at the same time. A sufficient amount of electromotive force is supplied to allow either alone to operate in its maximum current-drawing condition.

Abstract: This system generates output pulses in successive periods of time, each including sub-intervals during which the output pulses may be varied in accordance with a pre-determined scheme. The time periods and sub-intervals within the periods are defined by means of signals derived from a fundamental clock frequency generation circuit and first and second parallel sets of frequency division circuits connected to the fundamental frequency generation circuit. The first set of frequency division circuits is used together with a sub-interval timing circuit to define the sub-intervals of time included in each period.

Abstract: This potentiometer has a pair of insulating standoffs integrally formed with the body of a model or toy incorporating the potentiometer. An insulated trough extends between the standoffs. A resistive element wound around an insulating core is disposed in the trough. A resilient contact element is slidably mounted engagement with the resistive element. Means extends through the body of the model or toy for sliding the resilient contact element along the resistive element. This potentiometer has major portions of its assembly formed in a molding operation used to form the body of the model or toy, and can be assembled by hand without the use of special tools.

Abstract: A foot operated cymbal assembly includes a cymbal stand with a cymbal mounted near its top. A first foot pedal is positioned near the bottom of the stand. A beater operated by the first foot pedal is positioned on the stand to strike the cymbal. A second foot pedal is positioned near the bottom of the stand. A cymbal vibration damper is positioned on the stand for selective engagement with the cymbal by operation of the second foot pedal. In preferred form of the invention, the foot pedals are positioned to be actuable by the same foot. This stand and cymbal assembly allows a single percussionist to produce a substantially more complex pattern of sounds using a cymbal than possible with the prior art.

Abstract: This game has an adjustable support to be worn around the torso of a player. A resilient ball is tethered to the support with a flexible cord. The length of the flexible cord is adjustable to a suitable length for allowing the ball to be hit in a forward stroke by a person wearing the adjustable support, passed partially around the torso of the wearer and be hit in a reverse stroke. The adjustable support and the tether may be formed from a single, flexible cord with one loop for adjustment around the torso and a second loop for adjustment of the length of the tether. This game allows a single player to maintain a volley with alternate forehand and backhand strokes.

Abstract: An automated color sorter for fruit and the like produces signals in the red and green spectrum from light reflected by each piece of produce passing an inspection station and operates upon these signals to generate color level signals employed to physically direct individual items according to predetermined color grades thereof. Computer operation upon the color level signals allows variation of sort levels or points and continuous inventorying of produce in predetermined grades.

Abstract: An electronic musical instrument has a keyboard including a plurality of scale keys and a plurality of chord keys. Musical sounds are generated by a programmable frequency divider network capable of producing different output frequencies, depending on which keys of the keyboard are activated. A decoding means connects the keyboard and the programmable frequency divider network to supply signals which cause the programmable frequency divider network to produce different output frequencies, depending on which keys of the keyboard are activated. Means connect the scale keys and the chord keys for altering signals supplied from the chord keys to the programmable frequency divider network, depending on which scale keys are activated. On this basis, compatible chords may be generated with the chord keys for a melody being played with the scale keys. The frequency divider network utilizes lowest common multiples and prime numbers, which substantially eliminates the potential for producing dissonant sounds.

Abstract: An element of an integrated circuit, such as an ion implanted region or a metal layer, may be laser trimmed without exposing P-N junctions or other circuit elements not to be trimmed to damage by the laser through use of the present protection process and structure. In the process, an oxide through which the laser trimming is carried out is formed over a selected portion of the circuit to be trimmed by the laser. A bare layer of a metal reflective to the laser radiant energy beam, such as aluminum, gold or silver, is formed surrounding the selected portion of the circuit. The selected portion of the integrated circuit is then trimmed with the laser. The oxide promotes trimming in the selected area by absorbing the laser radiant energy beam. The bare metal layer protects the portion of the integrated circuit underlying it by reflecting most of its energy.

Abstract: This workpiece holder has a plurality of workpiece supports vertically disposed with edges configured to support the workpiece facing upward. The workpiece supports are spaced by means of spacers in accordance with a predetermined dimension of the workpiece in order to allow the workpiece to be supported on the edges of the supports. The workpiece holder is especially designed for holding parts in assembly operations for manufacturing semiconductor device packages.

Abstract: A layer of chromium is removed from the metalization system on a silicon integrated circuit wafer that also includes copper and aluminum. By electrolytic etching in a sulfuric acid solution containing about 10% by volume water saturated with chromium sulfate, chromium can be removed without excessive removal of copper or aluminum.

Abstract: In transistor output stages, where the applied voltage exceeds the voltage rating of available transistors, stacking is employed to divide the voltage across two or more series connected devices. A complementary emitter follower transistor is employed in the biasing of the stacking transistor along with a current source acting as the emitter follower load. This arrangement provides constant current drive for the stacking transistor without resorting to low value biasing resistors which produce excessive current flow under quiescent conditions.

Abstract: A zener diode in which the anode region of a first conductivity material is formed by diffusion in a semiconductor body, a cathode region of a second conductivity material is formed by diffusion in the semiconductor body, and the two regions are bridged by a third region extending through the two regions, the third region being a shallow layer of ion implanted doping material of said first conductivity type. In one embodiment, the anode and cathode regions are spaced-apart; in a second embodiment the cathode region is formed within the anode region. The ion implanted layer has a concentration that peaks below the surface, thus establishing the breakdown point for the avalanching of the zener diode below the surface and removed from surface contaminants such as found in the oxide surface layer.

Abstract: A chopper stabilized comparator which compares two low level DC signals, and converts these signals to an AC signal which is amplified by AC amplifiers. The AC amplifier output is proportional to the difference between the two DC signals. The circuit has the advantage that it does not have any DC offset terms, for example, it does not drift with temperature.The comparator is implemented in CMOS technology wherein the actual physical layout of the circuit is chosen such that changes in mask orientation during the fabrication process have no effect upon the proper operation of the circuit.