Abstract: Water soluble xanthylium derivative substrates of rhodamine 110 and rhodol permit spectrophotometric and fluorescent measurements of trypsin-like enzymes without the addition of organic solvent additives and/or special water solubilizing agents. These novel substrates exhibit increased sensitivity for determining low levels of activity of trypsin-like enzymes such as proteolytic enzymes, cofactors, activators, antiactivators, and inhibitors. These substrates can be substituted for fibrinogen to monitor the pathways of blood coagulation.

Abstract: The converter delivers current to an intermittently energized load and includes a coupled inductor having a primary winding, a secondary winding and a feedback winding. A switching transistor is coupled in series with the primary winding of the inductor and switches between conductive and non-conductive states to control the flow of current through the primary winding. A positive drive circuit provides positive bias voltage to the switching transistor. A current limiting circuit senses the voltage across the base-emitter junction of the switching transistor to measure the primary winding current, removes the positive bias voltage when the primary winding current reaches a predetermined value, and thereby switches the transistor out of the conductive state into the non-conductive state.

Abstract: A forced air gas heating furnace system includes a thermostat having a transformer for converting the typical household 115Vac to a 24V thermostat ac control voltage, and a switch, the thermostat elements connected to the junction of an ac to dc converter, a digital control circuit and a TRIAC. The dc output is connected to a dc voltage regulator which outputs Vcc for a digital control circuit. The gate of the TRIAC is connected to the output of the digital control circuit, and operates in response thereto for selectively triggering the TRIAC for passing the 24Vac transformer control power to a solenoid operated gas valve.

Abstract: A radio receiver includes a noise blanking system comprising a switching circuit in the signal path which is responsive to a blanking signal for preventing passage of signals. A blanking signal producing circuit is in the signal path ahead of the switching circuit and is responsive to predetermined noise signals received by the radio receiver for producing the blanking signal. The receiver also includes an AGC circuit for producing a gain control signal and a signal strength meter coupled for response to the gain control signal. A linearity control system comprises a current controlling circuit responsive to a meter control signal for controlling the current flow through the meter so as to increase the range of linear response of the meter. A signalling circuit is coupled with the AGC circuit and with the current controlling circuit and is responsive to the gain control signal for producing the meter control signal.

Abstract: An electrical interconnector comprises an outer housing defining a first aperture; a rotor member occupying the first aperture in rotational relation to it; the first electrical connection carried on the outer housing; a second electrical connection carried on rotor member; and a coiled conducter wire loosely coiled in a plurality of coils about the rotor member with the outer housing, the coil conducter wire being connected at respective ends thereof to the first and second electrical connections. In this invention, one or more recesses are carried on either the outer housing or rotor member. One or more flexible detents are carried by the other of the outer housing and rotor, the detents being normally positioned to project into the recesses to prevent rotation between the outer housing and rotor member.

Abstract: A water activated locus identifying device for attachment to articles apt to be lost in a body of water wherein the water activation serves to operate an electric light thereby making the locus of the article more easily identified.

Abstract: A socket can be programmed to adapt the pin out configuration of an integrated circuit for convenient plug-in use or substitution in an environment, such as a socket, ordinarily intended for a similar integrated circuit with a different pin-out configuration. The invention includes a support, a first plurality of electrical contacts mounted in a prescribed pattern on one side of the support, a second plurality of electrical contacts mounted in a similar prescribed pattern on the other side of the support, at least some of the first contacts and some of the second contacts being electrically isolated from each other on the same and opposite sides of the support, and printed circuit traces and plated through holes coupling respective first contacts on one side of the support to respective second contacts on the other side of the support.

Abstract: An antenna coupling system includes separate low-noise receiving amplifier and down converter circuits for amplifying the antenna signal above background noise and for converting it down to frequencies compatible with a suitable receiver, respectively. The system is particularly intended for microwave frequency antennas of the type used to receive satellite signals. The amplifier circuit includes at least one microwave frequency amplifier, such as a GaAs FET, with a low frequency variable feedback circuit connected across it which is arranged to self-tune the amplifier to the antenna input signal strength. The converter circuit is of the image reject single conversion and image recovery type and is arranged to split the amplifier output signal into two parts which are each combined with a local oscillator signal and then re-combined in such a way that unwanted image signals are rejected.

Abstract: A local area network for digital information transmission to and from each of a plurality of building units in an area, such as homes in a neighborhood is provided, wherein all connections between units are wireless. Each unit is provided with and fm transceiver station, which is connected with an electrical system in said unit, such as a security system or a power distribution system in such a way that information can be gathered from said system and commands delivered to said system. Each transceiver is adapted to operate at a power level and on a frequency which does not require an FCC license. Each transceiver includes programmable means adapted to cause said transceiver to recognize transmission specifically addressed to it by other stations in the network, and to cause said transceiver to generate and send transmissions specifically addressed to other transceivers in the network.

Abstract: A circuit, which is useful to provide data needed to measure the electrical opacity of a particle, for instance a blood cell, passing through a Coulter type transducer, includes a current source for providing a conventional d.c. current through the sensing aperture of the transducer, as well as an oscillator for providing a high frequency current through the aperture. The oscillator includes an active device and a resonant circuit, and the aperture is coupled in parallel with the resonant circuit of the oscillator. The oscillator can be any type of oscillator, such as a Hartley oscillator. As a particle passes through the aperture, the resistance of the aperture increases, which in turn, increases the Q of the oscillator circuit, whereby the oscillator output signal is amplitude modulated in accordance with the increased Q. This amplitude modulated signal can be detected to provide a value based on the high frequency reactance of the particle being detected. The change in d.c.

Abstract: A preheater for heating either intermediate or small size electrical wire includes left and right inductors, each having a longitudinal passageway through which the wire to be heated is passed, one inductor being fixedly mounted on a mounting plate with its passageway vertical and the other inductor being pivotally mounted on the mounting plate so that its passageway can be either positioned vertically or tilted at an angle from vertical, a lower wheel rotatably mounted on the mounting plate below the inductors, a first upper wheel sized for use with intermediate diameter wires and a second upper wheel sized for use with small diameter wires, only one of the upper wheels being mounted on the mounting plate at a time. When intermediate size wire is being run, the pivotally mounted inductor is positioned with its passageway vertical and the first upper wheel is rotatably mounted on the mounting plate above the inductors and vertically aligned with the wheel.

Abstract: An apparatus for detecting an angle of rotation is disclosed which comprises a rotary magnet having four poles, two magnetic sensors of a ferromagnetic material disposed over the periphery of the rotary magnet so as to face the magnetic poles of the rotary magnet and to have a phase difference of 3.pi./8 therebetween, a signal generating portion for applying the magnetic sensors of a ferromagnetic material with a first and a second sine-wave signals having a phase difference of .pi./2 in electrical angle therebetween, a synthesizing portion for synthesizing signals output from both of first magnetic sensor of a ferromagnetic material and second magnetic sensor of a ferromagnetic material thereby to output a synthesized signal with a phase difference corresponding to an angle of rotation .theta. from the first sine-wave signal, and a rotational angle detecting portion for detecting the angle of rotation based on the phase difference.

Abstract: A fiber optic contact comprises a fiber optic cable having a first free end, and a sleeve member surrounding the first free end and proportioned to support the first free end in abutting relation with a second free end of another fiber optic cable for optical transmission between them. In accordance with this invention, a collet is slidably mounted on the sleeve member. Compression spring means are carried on the sleeve member between the collet and the first free end, so that the contact may be retained in the desired abutting relation by retention means that engages the collet in a position to bias the first free end against the second free end through the spring means.

Abstract: A socket device for an integrated circuit package having fine pitch or closely spaced leads or contact pads. The socket device includes a base having a platform for supporting the IC package. Opposed actuating latches are pivotally carried upon the base at opposite sides of the platform to accommodate receipt and retention of the integrated package. The socket device includes a plurality staggered contacts in multiple ranks at opposite sides of the platform adjacent the actuator latches. The contacts engage the actuator latches so as to be moved between open and closed positions upon pivotal movement of the latches.

Abstract: There is disclosed a twist drill particularly adapted for drilling plastics and composite materials having a sharp point angle, typically 85.degree. to 95.degree., and a very low lip relief angle, typically 2.degree. to 3.degree.; the relief surfaces are broad, though not unusually so, and may each subtend an angle of 40.degree. to 60.degree. about the drill longitudinal axis. A two-flute drill is shown, but the structure may be modified to provide three or more flutes. Land width, helix angle, and other attributes of the twist drill are generally similar to most common varieties of twist drills for steel, wood, or other uses in drill presses or hand drills.

Abstract: A solder button may be attached to an elongated conductor by substantially surrounding a portion of the conductor with a mass of solder. The mass of solder may be crimped or heat welded into fixed position onto the elongated conductor, which is typically in ribbon form, with the solder being cut from a strip of solder by cutting and crimping means, the strip of solder being in transverse relation to the conductor at the crimping means. The elongated conductor, with attached solder buttons, may be attached by automated means in a single step to a pane of glass or the like.

Abstract: A flexible electromagnetic pulse shielding conduit for electrical conductors which is constructed of a backshell to which is secured a flexible, sheet material tube and an electrically conductive metallic braid. The braid is located about the tube with both the braid and the tube being secured to the backshell through the use of a metallic band which is shrunk concentrically through the technique of magnetic pulse forming which thereby makes a positive secure connection between the backshell, the braid and the tube. A rubber sleeve is located about the braid which is also secured to the backshell through the technique of magnetic pulse forming which shrinks a second metallic band. The second metallic band overlaps the first metallic band.

Abstract: A parallel bus alarm system in which address signals are represented by successive voltage steps, and responses are represented by current increments. Each alarm element, in response to its addressing, controls a variable current increment to flow in the bus, the magnitude of the current increment being a function of an associated analog measurement to be reported. Each alarm element also causes a predetermined current increment to flow in the bus in response to a condition arising which requires reporting, the total current change thus being directly proportional to the number of alarm indications.

Abstract: This invention provides an attachment structure of a car sound apparatus of the type in which an inner case is fitted in an opening of a dashboard panel and the car sound apparatus is inserted through an insertion hole of the inner case and attached there, which is characterized in that pin fitting portions are provided on the front ends of the side faces of the inner case each comprising an inclined edge and a fitting groove, and lock pin units are provided on the side faces of the car sound apparatus each allowing up and down movement of its lock pin, wherein at the time of attaching the car sound apparatus to the inner case the lock pin moves along the inclined edge and fits in the fitting groove of the pin fitting portion, whereas at the time of detachment the lock pin is moved upward by means of a removing member to release engagement with the fitting groove to thereby permit pulling out.

Abstract: A thermal printer and label applicator includes a transport system for moving linerless thermosensitive paper from a stack or roll thereof to a printing station and a cutting station. Thermal print head at the printing station is provided to imprint a preselected heating pattern in the linerless thermosensitive paper in order to form desired visible images thereon. A cutter is provided to separate the linerless thermosensitive paper into individual labels, and a vacuum system transports the separated individual labels from the cutting station to an adhesive activation station and thereafter to a label ejection station. At the adhesive activation station, the adhesive is activated and thereafter a vacuum/blower system at the label ejection station causes airborne transport of the individual separated labels onto goods which have been placed in receiving position by a conveyor system. Operation of the thermal printer and label applicator is coordinated by a control system.