Abstract: An electrically conductive elastomeric foam is presented. Preferably, the elastomeric foam comprises polyurethane foam and in accordance with an important feature of this invention, the elastomeric foam is rendered electrically conductive by incorporating therein electrically conductive fibers. As used herein, a "fiber" has a diameter greater than or equal to one micron, and an aspect ratio (length/diameter) greater than or equal to fifteen. In accordance with the method of the present invention, the elastomeric foam is prepared from a polyurethane stock comprised of a polyhydroxyl compound, an organic polyisocyanate compound, a catalyst, a foam stabilizer and an amount of electrically conductive fiber which is effective to render the elastomeric foam electrically conductive.

Abstract: An electric power busway system comprises a bus bar support housing with the opposite side plates of the housing shaped with troughs to hold the bus bars in their relative positions, preventing the bus bars from moving towards or away from one another and providing the necessary short-circuit protection and bending resistance. The metal side plates are preferably fastened together without the use of fasteners or the need for welding, through the use of a punch and die tool set. A protective insulating sheet is sandwiched between the insulated bus bars and the housing to protect the bus bar insulation coating from ruptures or tears. Clamping blocks are provided outside the protective busway housing to apply friction on the bus bars within, keeping them from sliding out of the housing assembly. The integral busway housing and clamping serve as a ground conduction facility, with the clamping blocks providing a mechanism to connect the busway section to an adjoining section.

Abstract: Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed from the digital signal to thereby define a phase of the power line. An interval of orthogonality is determined from the sensed voltage and current signals, coinciding with passage of an integral number of cycles of a fundamental frequency reference signal which is computed from the computed phase-to-neutral voltage signal. A vector metering quantity is computed for the determined interval of orthogonality from the computed phase-to-neutral voltage signal and the computed phase current signal. The vector metering quantities to be computed may be identified and computed based upon an associated detent. The vector metering quantity is also computed based on an identified circuit topology.

Abstract: A dental impression composition for use in the preparation of the oral tissue models comprising a dimethicone-based polysiloxane polyester polymer having terminal fluorinated alkoxy substituents such that the fluorine content of the polysiloxane polyester is in the range from about 5% to about 30% by weight, and having the general formula A--?--B--C--!.sub.x --A, wherein x is an integer greater than 1; A is a fluorinated alkoxy group having the formula F.sub.3 C(CF.sub.2).sub.n (CH.sub.2).sub.m O-- wherein n is an integer from 3 to 17 and m is an integer from 2 to 4; B is a diacid; and C is a dimethicone-based polysiloxane copolyol having the formula:Me.sub.3 Si--?--OSiMeR.sup.1 --!--?--OSiMeR.sup.1 --!.sub.o --?--OSiMeR--!.sub.q --OSiMe.sub.3wherein Me is methyl, R is methyl or phenyl, o is an integer in the range from 1 to 19, q is an integer in the range from 0 to 200, and R.sup.1 is a polyoxyalkylene substituent having the formula--(--CH.sub.2).sub.3 --(DO).sub.a (EO).sub.b (FO--).sub.

Abstract: A fuel supply system for supplying fuel to the cylinders of an associated engine is disclosed. The system comprises a fuel pump for supplying high pressure fuel to a delivery line, a plurality of injectors connected to the delivery line and means operable to deliver fuel through the injectors to respective cylinders of an associated engine, and a control valve connected to the delivery line and operable to control the pressure of fuel within the delivery line.

Abstract: An ambient air breathing device for use in combination with a full face mask. Full face masks are intended to be sealed around periphery of the face of the wearer and, therefore, require that the wearer breath on tanked air even before such air would be necessary to sustain life. The breathing device of the invention allows the wearer to breathe ambient air thus conserving otherwise supplied air for use when needed.

Abstract: A filter and method and apparatus for manufacturing the filter. The filter includes a first filter layer and a second filter layer. The first and second filter layers are joined by a ribbon. The ribbon is attached to the first filter layer and the second filter layer through ultrasonic welding. The apparatus includes first and second ultrasonic welders for attaching the first filter layer to one end of the ribbon and the second filter layer to the other end of the ribbon.

Abstract: A compact current limiting circuit breaker utilizes a polymer current limiter, an arc rail and an arc gap for effective overcurrent protection. Upon the occurrence of contact separation an arc is drawn between the circuit breaker contacts and driven toward an arc rail. Commutation of the arc from the stationary contact to the arc rail effectively changes the current path to incorporate the polymer current limiter which rapidly suppresses the overcurrent. Circuit isolation is achieved by extinction of the arc within the arc gap between the movable contact and the arc rail.

Abstract: A plurality of variable speed centrifugal compressors operated in parallel form an HVAC or refrigeration system. The compressors are operated at proportionally synchronized speeds throughout their range of operation.

Abstract: A method of verifying the authenticity of an object is disclosed employing a spatial integrating optical correlator. An unreadable and hence non-counterfeitable mask (e.g., a. complex mask or a phase mask) is coupled to the object and the optical correlator compares the mask with a reference mask on which it is scanned over. The correlator produces a correlation spot or image having an intensity which exceeds a given level if the mask is genuine. An alternate embodiment includes a fingerprint or other personalized pattern bonded to the mask, and the fingerprint or other personalized pattern on the card is compared to a reference fingerprint or other personalized pattern of the card holder for added security.