Abstract: An engine assembly that is powered by high pressure vapor from a volatile liquid that has a boiling point substantially below the minimum ambient temperature in the geographical location in which the engine assembly will be used. Heat for volatilizing the liquid may be withdrawn from the ground, naturally occurring sources of water, as well as from sunlight and waste heat from industrial installations. Although the engine assembly is capable of being used to produce power for any desired purpose, it is particularly adapted for use in pumping water from a well, with the pumped water not only being used for irrigation purposes and the like, but also to effect an initial cooling of the low pressure vapor discharged from the engine assembly prior to the vapor being further cooled and pressurized to return to the liquid state whereupon it is heated and recycled through the engine assembly.

Abstract: A processor for an echo canceller generates an estimate of an actual echo on an echo path and applies the same to a subtractor circuit in the path to cancel the echo. To generate the echo estimate, the processor multiplies A-law digitally encoded samples of signals which cause the echo by A-law digitally encoded samples of impulse responses of the echo path and sums a plurality of the products. The particular manner of multiplying the A-law samples produces a product which is a precise linear representation of the product of the linear equivalents of the samples, and no errors or approximations occur in the multiplication or in generation of the echo estimate.

Abstract: A residual echo suppressor for an echo canceller compares the levels of the uncancelled signal and the residual signal. If the level of the residual signal has a selected proportionality to the level of the uncancelled signal, it is assumed that the residual signal consists solely of echo and it is suppressed to zero. If the residual signal fails the proportionality test, which indicates that it may contain speech, it is transmitted in its entirety. To prevent sporadic transmissions of residual signal which fails the proportionality test, but which might not contain speech, a hysteresis circuit blocks transmission of the residual signal upon the same continuously failing the proportionality test for a selected time, at the end of which time the residual signal is assumed to contain speech and is transmitted.

Abstract: Installation apparatus for installing pre-assembled escalators having upper and lower ends in an operating position between upper and lower landings, including wheeled support apparatus for supporting and transporting an escalator. Scissors lift apparatus mounted on the wheeled support apparatus, and a pivotal escalator truss support and locater assembly mounted on the scissors lip apparatus, cooperate to provide both vertical and angular adjustment of the escalator, in order to permit the upper end to be aligned with and then supported by a support wall associated with the upper landing, and to permit its lower end to be subsequently lowered into a pit associated with the floor of the lower landing.

Abstract: A process for forming a fuel cell electrolyte matrix on the surface of an electrode involves passing the electrode through a vertically falling curtain or waterfall of the matrix material carried in a liquid vehicle. The coated electrode is then heat treated to remove the liquid vehicle, leaving a layer of matrix material on the electrode surface. This curtain coating process has been used to produce matrix layers of 2.5 mils having a variation in thickness of no more than 0.2 mils.

Abstract: A power generating assembly in which a portion of the heat energy in a stream of fluid such as warm or hot air is extracted and transformed to rotary power as a body of low boiling liquid is recirculated through a closed path. Vapor of the liquid liquifies when subjected to a pressure greater than a first pressure and a temperature lower than a first temperature. The vapor is superheated by the heat energy above-identified to a high pressure at which it actuates a reciprocating mechanism to produce rotary power. Vapor discharging from the reciprocating mechanism is allowed to expand adiabatically in a first confined space, and be cooled. A compressor draws vapor from the first confined space and discharges the same into a second confined space at a pressure greater than the first pressure. The temperature of the vapor in the second confined space is lowered below that of the first temperature whereupon the vapor assumes the liquid form.

Abstract: An electrolyte reservoir layer disposed behind and adjacent one of the catalyst layers of a fuel cell is porous and hydrophilic to the electrolyte. In one embodiment the reservoir layer includes impregnations of hydrophobic material to provide reactant gas passages through the reservoir layer to the catalyst layer. Additionally the reservoir layer includes impregnations of a material similar to the fuel cell electrolyte retaining matrix material to improve electrolyte transfer from the matrix into the reservoir. The impregnations of hydrophobic material are designed to provide good distribution of the reactant gas into the catalyst layer without consuming a large volume of the reservoir. In a preferred embodiment the reservoir is also the electrode substrate whereby the catalyst layer is bonded to the surface thereof.

Abstract: A power generating device that transforms the energy of vapor under pressure from a volatile liquid into useful rotational power that may be used in a stationary location or to propel a vehicle. The vapor under pressure is generated either by heating the volatile liquid in a confined space by means of fuel, or by utilizing solar energy for this purpose.After the vapor has passed through the power generating device it is cooled and returned to the liquid state. The volatile liquid is, by means of a pump, returned to the confined space where it is again heated to transform to vapor under pressure, with the vapor then being recycled through the power generating device.