Abstract: Disclosed is a mounting and display medium comprising a foldable support base with a pressure-sensitive adhesive on one major face thereof and a release material covering the adhesive. A window is defined in one section of the support base by a continuous cut in the base support medium. The window is formed by removing the release material from said one face of one section of the base support and the visual display placed with its face exposed through the window. The support base is then folded to secure the visual display between the opposed folded sections of the support base.

Abstract: Control apparatus for controlling the operation of a gas valve in a gas heating system which includes thermostatic switch means and a source of AC voltage which are connected to form a series circuit with the gas valve is disclosed. The control apparatus comprises switch means which is connected to provide continuity in the series circuit upon receipt of a first control signal and to remove the continuity in the series circuit upon removal of the first control signal. Isolation means receives a second control signal having a high state and an alternate low state and generates the first control signal when receiving the high state of the second control signal. A power supply receives the AC voltage when the thermostatic switch means is closed and provides a DC voltage to a timer means. The timer means then generates the second control signal.

Abstract: Methods and apparatus for dispensing a fluid with dispersed particles therein are disclosed which include a reservoir containing the fluid and dispersed particles. The fluid is agitated to maintain dispersion of the particles. The output of the reservoir is provided through a filter to a three-way valve and pressurized as required. The common port of the three-way valve is connected to a print module controlled by a programmable controller. Bypass flow is provided to increase the flow rate through the system. The system may be operated in either the demand mode or the continuous mode.

Abstract: A latent heat economizing device having a shell forming a chamber, a saturated refrigerant inlet, a liquid refrigerant outlet, a dual air pass and a suction gas pass is provided for installation in the liquid refrigerant line of a refrigeration system prior to an existing liquid sub-cooler upstream from a metering device in the direction of flow. The inlet includes means for distribution of saturated refrigerant evenly over the internal surface area of the chamber to effect heat transfer and removal of the latent heat of condensation from the vapor and sub-cooling of refrigerant liquid. A liquid level is maintained within the shell to effect heat transfer from the liquid to the suction gas pass. The outlet for the liquid is connected to the lowest part of the shell to insure that no vapor is passed through the outlet to the metering device.

Abstract: Disclosed are mounting housings for use on burn-in boards, circuit boards and the like. The housings include an insulating base support containing a plurality of electrically conductive axially elongated pins extending therethrough. A spreader mounted for reciprocal movement with respect to the pins and normal to the first major face of the base support has a plurality of spreader members adjacent the pins so that movement of the spreader deflects the pins longitudinally to permit insertion of the leads projecting from the device package between the pins and permitting the pins to contact only the edges of the leads.

Abstract: Disclosed is a compensating roll pin securing a heat sink to a circuit board. The roll pin comprises a deformable body of resilient material, such as annealed spring steel, formed into a generally cylindrical body having first and second end portions separated by a middle portion of enlarged external diameter and an axially extending gap in the surface of the body. A method of use is also disclosed wherein the first end portion of the roll pin is inserted into an aperture in a heat sink and the middle portion deformed within the aperture to form a tight fit between the pin and heat sink. A substantial part of the middle portion remains outside the aperture in the heat sink. The second end portion is inserted into a hole in a circuit board and forms an interference fit therewith. The middle portion forms a stop to prevent further insertion of the roll pin into the circuit board so that a gap of predetermined distance separates the heat sink and circuit board to enhance cooling.

Abstract: Described are methods of and systems for seismic exploration wherein a master station and a plurality of slave stations are utilized in conjunction with remotely located seismic sources. The system includes apparatus at the master station for generating a start signal and transmitting that signal over single frequency radio link to each of the slave stations. Upon receipt of the start signal at the slave stations the seismic sources are energized in a preprogrammed mode. The field time-break and signature of the seismic energy is acquired and transmitted via the same radio link to the master station. The time-break of one of the sources is transmitted in real time and thereafter each slave station is polled or interrogated by the master station to transmit via the same radio link the time-break and amplitude data representative of the signature of each of the sources before the generation of the next start signal.

Abstract: The method and apparatus for generating seismic vibrations in a liquid includes an electronically controlled, hydraulically powered generator that includes a piston assembly reciprocally mounted on a cylindrical post in a generator housing. The control apparatus includes a control valve that is located very close to the piston assembly thereby reducing the volume of the passageways extending to the piston assembly so that the cyclic rate of the piston assembly can be very rigid and can be changed accurately and quickly. An extended life is provided by releasing the high pressure fluid driving the piston assembly prior to impact between the piston assembly and the post and by providing a trapped volume of fluid in the chamber to damp the movement of the piston assembly toward the post.

Abstract: An intercommunications system for the selective establishment of two-way communications between a multiplicity of stations is disclosed and comprises a terminal located at each station and a communications network including a predetermined number of lines for interconnecting any one of the terminals to at least one other of the terminals.

Abstract: An archery bow having spaced upper and lower pulley assemblies rotatively mounted on either end of the bow handle. Upper and lower limbs are pivotally mounted on either end of the handle. A bowstring extends between the tips of the limbs. A pair of tension cables connect the upper and lower limbs together, with each of the tension cables engaging one of the pulley assemblies. The tension cables further engage another set of pulley assemblies each rotatively mounted on the upper and lower limbs. Adjustment devices are provided to independently adjust the tension on the tension cables.

Abstract: Uninterruptible power supply apparatus which provides for supplying ac power to equipment even if and when the primary ac power is interrupted is disclosed and comprises an ac to dc converter connected to receive the primary ac power. The output of the ac to dc converter is applied to a dc power source. The resultant output of the ac to dc converter and the dc power source is provided as a dc input to a dc to ac inverter. The dc to ac inverter comprises an output transformer having a center-tapped primary. A first switching device is connected between a first end of the center-tapped primary and the negative terminal of the dc input to provide power pulses to one-half of the center-tapped primary. A second switching device is connected between a second end of the center-tapped primary and the negative terminal of the dc input to provide power pulses to the remaining half of the center-tapped primary.

Abstract: Disclosed is a test fixture for connecting a plurality of electronic device packages to test apparatus. The fixture includes a plurality of test sockets and means to selectively interconnect the socket leads with external test apparatus. The test fixture may be used as a burn-in board as well as a test, transport and storage medium to reduce individual handling of electronic device packages.

Abstract: An analog-digital converter includes a source of high frequency pulses comprising a variable frequency oscillator having an output frequency f which is a function of an analog condition. Also included is a source of a reference signal, preferably pulses, having a fixed frequency whose value is a fraction of the value of the frequency of the variable frequency oscillator. The first named souce also includes a counter-divider to which the output of the variable frequency oscillator is applied. The counter-divider has an output which is either f/N or f/N-M where N and M are whole integers and M is less than N. A phase comparator is responsive to the reference signal and to the output from the counter-divider for measuring the phase difference between the reference signal and the output pulses from the counter-divider.

Abstract: A system with improved signal-to-noise ratio for digitizing a representation of an analog condition comprises two oscillators for generating high frequency digital pulse signals, the frequencies of which are harmonically related one to the other. One of the oscillators responds to the analog condition to cause a shift in phase in its digital signal to cause phase differences between the digital pulse signals. The phase differences include quantizing errors having energy from D.C. to one half the frequency of said digital signals. A phase detector detects the phase differences. The detected phase differences are applied to a low-pass filter to produce a signal representative of phase error in a frequency band of interest. A phase modulator modulates the phase shifted digital signal in response to said signal representative of phase error to enhance the phase difference in said frequency band of interest.

Abstract: Disclosed is a toothbrush and a method for cleaning teeth having a dental brace mounted thereon. The toothbrush includes a handle and a head portion on one end of the handle. A plurality of bristles are mounted on the head portion and arranged into a single longitudinally aligned row for receipt of toothpaste or the like. The head portion may be presented parallel to the teeth and the bristles inserted between the dental brace and the side of the teeth. Food particles, plaque and other contaminates may be removed from the teeth by a reciprocal motion of the toothbrush with respect to the teeth.

Abstract: A tubing string resettable packer is conditioned for initial wireline installation in a well utilizing an adapter within a mandrel carrying the slip assembly of the packer and frangible connecting means between the sealing assembly and mandrel to place the sealing assembly in an alternate transport condition for first being set by means of a wireline device. Thereafter, the tubing string may be connected to the packer downhole to release the packer for resetting in a different position.

Abstract: Described is a method of driving a seismic vibrator with a control signal to produce an output signal having minimized harmonic distortion. The method includes the steps of producing a plurality a harmonic distortion signals related to a fundamental frequency of the control signal. The phase and amplitude of said harmonic distortion signal is varied to produce with the vibrator suites of variations of the distortion signal. From among suites of variations there is selected that harmonic distortion signal having phase and amplitude values which produce a minimum value in harmonic distortion signal amplitude. The steps are repeated for different fundamental frequencies and the selected signals are summed with their related fundamental frequencies to produce a vibrator sweep control signal. The seismic vibrator is driven with the control signal to produce an output in which harmonic distortion is significantly attenuated.