Abstract: A method and apparatus for altering the apparent electrical characteristic of a distributed electrical component in an integrated circuit is disclosed. In one form a distributed load resistor is sunk into a parallel distributed guard resistor. The mutual distributed capacitance between the distributed load resistor and the parallel distributed guard resistor is substantially greater than the distributed capacitance between the distributed load resistor and any other electrical component. A follower circuit for driving the voltage across the parallel distributed guard resistor by the voltage across the distributed load resistor is provided.

Abstract: Disclosed is apparatus for aligning a plurality of circuit packages in a row and transferring the row of circuit packages to a corresponding row of receiving sockets in a burn-in board. The apparatus includes a transfer arm carrying a transfer rack pivotal about a non-rotatable shaft which moves axially to raise and lower the transfer arm. The transfer rack includes a plurality of reciprocal blades adapted to receive the circuit packages therebetween and transfer them to the receiving sockets. The reciprocal blades are retracted to release the circuit packages and the pins on the circuit packages are inserted into the sockets by spring loaded plungers positioned intermediate the blades.

Abstract: An apparatus to transfer heat to a product is disclosed. In one arrangement, the apparatus includes a cabinet which forms a product input port, a product output port and a product support means including a conveyor in the cabinet for transporting the product from the input port to the output port while heat is transferred to the product. Products can be accessed while on the conveyor, including putting products on the conveyor and taking products off the conveyor so that the length of time that a product is heated can be varied while maintaining a substantially constant conveyor speed. One arrangement includes a side loading door for putting products on the conveyor, taking them off of the conveyor and manipulating the products while on the conveyor so that the ordinary heating cycle is altered. The loading door includes a panel hingedly connected to the bottom edge of the opening, movable about an axis of rotation between a closed position and an open position internal to the cabinet.

Abstract: This invention relates to a lay out square which can be folded from a flat position for storage to a position wherein the legs are substantially perpendicular to each other. A body comprising first and second legs spaced apart equal distances form a U-shaped member which is joined to a face marking portion formed by third and fourth legs aligned where first and second legs and having hinge means to pivotally secure the body portion to the body at substantially right angles.

Abstract: A surface wave device is disclosed which includes a substrate (12) having a piezoelectric surface (14), an acoustic surface wave transducer (16 and 18) for converting between an electrical signal and acoustic surface waves propagating on the piezoelectric surface and reflective structures (22) which cause reflections of acoustic surface waves in the portion of the piezoelectric surface over which the transducer is disposed. Numerous kinds of reflective structures are disclosed. An acoustic surface wave resonator using the present invention is disclosed, along with bandpass filters with multiple poles. A low-loss transversal filter using the present invention is also disclosed.

Abstract: An apparatus (10) for transforming digital data stored in a memory (18) into sounds is disclosed. The apparatus includes an oscillator (12) which drives an address selector (14). The address selector drives the memory. A note generator (20) generates an analog electrical signal responsive to the memory, and a speaker with its associated amplifier stages (22) produces sounds corresponding to the analog electrical signal.A preferred arrangement of the note generator includes an inverting amplifier which can simply be a logic gate (44) and a plurality of resistors (50) selected by switches (56) in feedback relationship with the amplifier.A preferred arrangement includes a duty cycle selector (80) to produce harmonics of the fundamental frequency of the analog electrical signal.

Abstract: An apparatus having a plurality of time delays for providing simulated reverberation of an electrical signal representative of sound is disclosed. The time delays are chosen so that delay times of initially delayed signals and reflected signals are logarithmically evenly spaced. One arrangement is adapted for driving a plurality of amplifiers of a multiple channel amplifier system by dividing the time delays into a plurality of groups responding to the plurality of amplifiers, and then connecting the groups of time delays to the amplifiers. A different group of time delays can drive each amplifier.

Abstract: Disclosed is a radiant energy converter which directs concentrated radiant energy in a first direction through or to a plane of limited area. An energy absorbing fluid is passed through the plane in the opposite direction so that the concentrated radiant energy is absorbed directly by the fluid. The converter may be used in connection with conventional collectors and concentrators to provide more efficient conversion of radiant energy. Also disclosed is a magnetohydrodynamic generator employing the converter of the invention.

Abstract: Disclosed is apparatus for forming an opening in a sealed container. A score or weakening groove is formed in the container end to define a tab which includes a raised boss. An opening bar movable with respect to the container but affixed thereto is moved over the container end to contact the raised boss. The tab is thus depressed into the container and severed along the weakening groove to form an opening. The opening bar is positioned over the tab during shipment and during the initial opening procedure to protect the tab during shipment and to protect the user from the contents of the container during the initial opening procedure.

Abstract: A duct reinforcement and a method for building the reinforcement including a special tool for use in a preferred method are disclosed. The duct reinforcement icludes a support washer on each of two opposing sides of the duct to be supported and a stiff wire extending through the sides of the ducts and both washers. The portion of the wire protruding beyond each support washer on the outside of the duct forms a hook with a tip of the wire substantially opposed to the outer face of the respective support washer. A preferred form of the support washer forms a volcano-shaped contour surrounding the washer hole on the outer face so that the tip of the wire makes contact with the washer inside the crest of the volcano-shaped contour. A preferred arrangement includes a rubbery seal between each support washer and the respective side of the duct to prevent leakage from the duct.

Abstract: A control system (12) for environmental units (10) such as air conditioners or heaters is disclosed.A control panel (14) accommodates a control module (16) associated with each unit. First and second temperature reference circuits (58 and 60) are located in each module for setting first and second reference temperatures. A circuit (64) responsive to a clock (62) selects the first reference temperature during a first predetermined time period and the second reference temperature during a second predetermined time period. Each unit is thermostatically controlled according to the selected reference temperature.

Abstract: The present invention detects the presence of liquid and it is used to control pumping of a well when the quantity of liquid being discharged by the pump per stroke is much less than the volumetric displacement of the pump.A fluid detector (96) includes a first thermally conducting body (98), a first heater (100), a first temperature detector (108), insulation material (122, 124 and 136) for thermally insulating the first thermally conducting body, a second thermally conducting body (102) exposed to the inside of a conduit (104), a second heater (106) for heating the second thermally conducting body and a second temperature detector (110) for detecting the temperature of the second thermally conducting body or the second heater. One arrangement also includes an electrical bridge network (112) for comparing the relative rates of heat loss from the two thermally conducting bodies.

Abstract: Disclosed are systems for removing hydrocarbons from subterranean deposits thereof. A fluid-impervious barrier screen is formed to isolate parts of the deposit or to isolate the deposit from adjacent fluid-permeable earth formations. The barrier screens are formed by fracturing a vertical zone in the formation by micropercussive fracturing or detonation of microexplosive charges in a series of closely-spaced bore-holes to form a vertically extending fractured plane. The fractured plane is sealed with a sealing medium to form a fluid-impervious screen.Hydrocarbons trapped in the enclosed deposit zone are flushed from the formation by recirculating a fluid medium such as superheated brine and/or hot gases through the enclosed deposit zone under sufficient pressure to cause turbulent flow through the pore formations and to relieve the overburden pressure. The flushing medium may be injected in a series of pressure pulses to force the fluid through the pores by hydraulic ramming.

Abstract: An apparatus for loading circuit packages having a first support surface (36) for supporting a circuit package and a pressure pad (38) spaced apart from the support surface (36) for applying pressure to a circuit package is disclosed. A second support surface (48) which is substantially in line with the first support surface supports a circuit package for unloading. The support surfaces move in a direction substantially perpendicular to the plane of the surfaces so that circuit packages are inserted straight into their sockets and removed straight from their sockets. A gravity circuit package feeder (20) feeds circuit packages onto the first support surface. A circuit package stop (54) is located at the end of first support surface opposite the gravity feeder (20). The support surfaces are inclined to the horizontal so that a circuit package comes to rest against the circuit package stop.

Abstract: Disclosed is apparatus for forming an annular groove or recess in the external surface of a pipe section at a predetermined distance from the open end of the pipe. The grooving apparatus comprises a cylindrical body with a tapered external surface at one end, the external diameter of the tapered end increasing with axial distance from the open end. An inwardly projecting lip is formed on the internal surface of the grooving tool and axial slots cut into the tapered surface and the lip. The grooving tool cooperates with a sizing tool having a correspondingly tapered internal surface. The open end of a pipe section is forced through the sizing tool to form a sized end portion of predetermined length.