Abstract: Disclosed are a filtered hydrophone circuit and a method of filtering hydrophone output signals. The circuit, in its most elemental embodiment comprises: (1) a hydrophone having first and second output conductors, the hydrophone producing an electrical signal of varying frequency, (2) an operational amplifier having first and second inputs and an output, the first amplifier input coupled to the first hydrophone output conductor, (3) a first resistor coupling the amplifier output to a second resistor, the second resistor further coupled to an electrical ground and (4) a capacitor coupling the second amplifier input to a point between the first and second resistors to thereby define a feedback path between the amplifier output and the second amplifier input for portions of the hydrophone electrical signal above a selected cutoff frequency, an output signal of the amplifier thereby substantially freed of the portions of the output signal below the selected cutoff frequency.

Abstract: An axial flow cooling fan includes a rectangular housing base portion and a plurality of rectangular plate members, all having corner portions and central circular air flow openings. The plate members have corner openings and integral hollow cylindrical spacer members formed on side surfaces of their corner portions and aligned with their corner openings. To construct the housing subassembly the base portion post members are sequentially inserted through the corner openings of each plate member. Resilient finger structures on the outer ends of the post members create a snap-fitted locking engagement with the outermost plate member and anchor the plate members in a stacked, parallel relationship in which the installed plate members are held apart by their integral spacer portions to create side air inlet openings on the subassembly at edge portions of the stacked plate members. The housing base portion has a motor-driven impeller section operatively supported within its central air flow opening.

Abstract: A tubular recuperative heat exchanger structure is mounted in a housing chamber within a fuel-fired condensing furnace in the vertical flow path of supply air being flowed through the housing by a blower. The heat exchanger structure comprises a primary heat exchanger defined by a vertically serpentined series of combustor tubes into open inlet ends of which a series of inshot-type fuel burners flow flames and hot combustion gases, and a secondary heat exchanger formed from a horizontally extending series of finned heat exchanger tubes having inlets in flow communication with the outlets of the combustor tubes and outlets in flow communication with the inlet of a draft inducer fan.

Abstract: The operation of U type drop-on-demand ink jet printheads are enhanced by selectively incorporating therein volume modifying tapers in the ink carrying channels, means for electrically isolating portions of the actuators thereof, and/or forming a variable layer of conductive material between the upper and lower sidewall portions therefore.

Abstract: A punctured, substantially deflated pneumatic automotive tire is internally sealed using a specially designed sealant canister containing CO.sub.2 gas propellant and a tire sealant mixture. The canister sealant comprises approximately 97% by weight of an acrylic latex material which is present with the propellant under a pre-use internal pressure of about 55-65 psig. An outlet cone portion of the canister is removably connectable to the tire inflation valve, and the internal volume and pre-use pressure of the canister are related to the internal volume and normal full inflation pressure of the tire in a manner such that the canister is operative to deliver essentially its entire contents into the tire, yet only partially inflates the substantially deflated tire past its initial pressure.

Abstract: An integrated multi-color drop-on-demand type ink jet printhead. The printhead includes a main body portion and a plurality of generally parallel, longitudinally extending ink-carrying channels arranged into at least two channel arrays. A manifold corresponding to each of the at least two channel arrays and in communication with each of the ink-carrying channels of the corresponding array is formed in the main body portion. Ink is supplied to each of the at least two channel arrays from a corresponding ink source, each of which is filled with a different color of ink.

Abstract: A support assembly for utilization with generally horizontal handles, bars, shafts and the like for securement of articles thereto. The support assembly includes both a unit which is integrally formed with a handle and a discrete assembly for attachment to handles. The assembly is preferably of integrally molded plastic that comprises at least first and second hook portions adapted for supporting articles such as packages, clothes and purses from strollers, carts and the like. The assembly may also include a receptacle region adapted for the retention of a canned drink, baby bottle, loose articles or the like. The assembly provides a myriad of hook configurations and demountable attachment sections for the securement of loose articles such as purses, sweaters, towels or other infant items. In this manner, strollers, bicycles and the like may be rendered safer and more convenient for the user who must handle loose articles.

Abstract: A system for innately monitoring a computer system. All address and data signals transferred over the system bus. Certain ones of the address signals are selected as related to the operating conditions of the computer system. A data filter selects data signals which correspond to the selected address signals and the selected address and data signals related to operating conditions of the computer system are then stored, either in a register if the selected address and data signals are composed of dynamic information requiring frequent status updates or in a first-in, first-out memory, when the selected address and data signals are composed of less dynamic information.

Abstract: Disclosed is a towed hydrophone streamer module comprising: (1) an elongated, fluid-resistant jacket having a substantially circular cross section, the water resistant jacket having mating connectors at ends thereof, (2) a plurality of sensors distributed in a spaced-apart relationship within the jacket, (3) a data bus positioned along a length of the jacket and terminating in electrical contacts in the mating connectors and (4) a plurality of cylindrical, fluid-resistant electronics housings disposed within the jacket in a spaced-apart relationship along a length thereof, each of the plurality of housings having a circuit board therein and spanning a length thereof and end caps at ends thereof, one of the end caps having electrical contacts coupled to components on the circuit board, a center-line of the housings substantially in alignment with a center-line of the jacket, the components coupling the plurality of sensors to the data bus for electrical communication therewith.

Abstract: An ink jet printhead includes of a lower body part having a base section and a plurality of generally parallel spaced projections extending upwardly therefrom and an upper body part having a top section and a corresponding plurality of generally parallel spaced projections extending downwardly therefrom. The top sides of the lower body projections are conductively mounted to the bottom sides of the upper body projections to form sidewalls which define a plurality of ink-carrying channels. Strips of a conductive adhesive mount the lower and upper body projections together and a controller is electrically connected to the strips to selectively impart either a positive, zero, or negative voltage to each strip. The lower body part is formed using a piezoelectric material poled in a first direction generally perpendicular to the channels and the upper body part is formed using a piezoelectric material also poled in the first direction.

Abstract: An upper end portion of an excavation ripper shank is captively and removably retained in a ripper box using a specially designed flex pin connector longitudinally driven into generally aligned openings in the ripper box and shank. The connector includes first and second rigid pin members held in a spaced apart, parallel, laterally facing relationship by a plurality of elastomeric members bonded to facing side surfaces of the pin members. When the connector is driven into the aligned box and shank openings the elastomeric members are compressed, causing the first and second pin members to drive the shank and box into forcible abutment with one another to substantially eliminate relative side-to-side play therebetween. Additionally, as the connector passes through the first and second openings its first and second pin members are caused to pivot relative to one another about an axis parallel to the compression direction of the elastomeric members.

Abstract: An aircraft armament mounting system includes an elongated support plank member which is insertable transversely through the aircraft cabin area so that a central portion of the plank is disposed within the cabin area and its opposite end portions project outwardly from the aircraft. The central plank portion is anchored to the air craft, and removable outer tip portions of the plank are vertically pivotable, about horizontal hinge lines, between extended and inwardly folded positions. When the outer plank tip portions are removed, specially designed mounting structures may be used to mount armament devices, such as machine guns, at the hinge lines at the outer ends of the remaining longitudinal plank portion. Representatively, these armament devices are .50 caliber machine guns housed in open framed pod structures having enclosed front end portions through which the jacketed barrels of the guns extend.

Abstract: A vertically elongated computer system tower unit has an internal sheet metal chassis portion having a bottom base wall to the underside of which four specially designed molded plastic stabilizing foot members are directly connected without the use of mounting screws or other separate mounting structures. Each support foot has a pair of top side retaining projections that are received in complementarily configured openings in the chassis base wall in a manner holding the foot member on the base wall and permitting the foot member to pivot between an initial installation position in which the projections may be inserted into or removed through the wall openings with the foot member underlying the base wall, a retracted position in which the foot member is pivoted outwardly from the installation position and underlies the base wall, and an extended position in which the foot member projects outwardly beyond the base wall and stabilizes the tower unit.

Abstract: An automatically controlled water spray air purification system is incorporated in a heating, ventilating and air conditioning unit serving a conditioned interior building space. The purification system is operative to receive a portion of the return air that would normally be flowed through the unit, mix the received return air with a quantity of outside ventilation air, purify the return air/outside air mixture using water sprayed from a sump portion of the purification system, and flow the purified air into the unit for mixture therein with the balance of the return air being flowed therethrough to the conditioned space. Damper structures on the unit and its associated air purification system permit selective variance of the percentage of the unit discharge air that has traversed the purification system.

Abstract: An LED indicating light assembly is mounted on the interior side of a computer housing wall, over a lens opening therein, and is operative to provide a visual confirmation that an operating component within the computer housing is activated. The assembly includes a mounting socket structure having an open front end securable to the housing wall over the lens opening, and an open rear end. An elongated lens member is longitudinally inserted forwardly into the socket structure to position a front end portion of the lens in the housing wall lens opening. As the lens is inserted into the socket structure, a transverse mounting pin portion of the lens, intermediate its front and rear ends, is latched into place by a resiliently deflectable outer side wall portion of the socket structure. An LED device positioned behind the mounted lens is used to illuminate its front end portion.

Abstract: Apparatus for determining whether the temperature of bath water is below a selected temperature. A bath mat having temperature related indicia imprinted on a top side surface thereof has a layer of temperature sensitive ink applied over the temperature related indicia. The temperature sensitive ink is selected such that it is transparent above the selected temperature and at least partially opaque below the selected temperature. When the temperature of the bath water exceeds the selected temperature, the temperature sensitive ink is transparent and, when the temperature of the bath water is below the selected temperature, the temperature sensitive ink is at least partially opaque.

Abstract: A computer tower unit is provided with two cooling fans, a system cooling fan and a power supply cooling fan, that draw ambient air through the unit via a pair of upper and lower exterior wall air inlet openings disposed opposite the two fans to cool a motherboard, a power supply unit, disc drives and expansion cards disposed in the unit. The need for a separate fan to cool the disc drives is eliminated by a specially designed air flow control baffle disposed within the unit. The baffle functions to cause cooling air drawn into the unit through the lower air inlet opening by the system cooling fan to be deflected toward and be drawn upwardly along the motherboard before being discharged by the fan, and also cause a portion of the air drawn into the unit through the upper inlet opening by the system cooling fan to be drawn through the disc drive mounting area within the unit to thereby cool the system disc drives without the use of a separate drive unit cooling fan.

Abstract: A flow meter apparatus for measuring the mass flow rate of a fluid using the Coriolis principle. A single straight flow conduit is employed which is vibrated in a radial-mode of vibration. Coriolis forces are thereby produced along the walls of the flow conduit which deform the conduit's cross-sectional shape as a function of mass flow rate. Additional embodiments are disclosed employing vibration of selected portions of the flow conduit walls. In addition, a method is described to determine the pressure and the density of a fluid by simultaneously vibrating a flow conduit in two modes of vibration and thereby determining pressure and density based on changes in each frequency.

Abstract: A length mode drop on demand type ink jet print head includes a lower body portion formed of an active piezoelectric material and an upper body formed from an inactive material. The lower body portion, which includes a plurality of longitudinally extending projections, is poled in a first direction generally orthogonal to both its longitudinal and vertical axes. The upper body portion also includes a plurality of longitudinally extending projections. The lower and upper body portions are mated such that the lower and upper body projections are spaced interdigitally with each other. By mating the lower and upper body portions in this manner, a plurality of ink-carrying channels are formed. The ink jet print head further includes a controller for selectively applying an electric field across each of the lower body projections in the poling direction.