Abstract: A surface wave device (10) having substrate with at least a surface layer of piezoelectric material (12) and at least one pair of opposing electrically conducting pads (14 and 16) is disclosed. A first group of at least three electrodes (18, 20 and 22) in a distance (24) of one half wavelength of a preselected operating frequency is disposed on the piezoelectric surface between the opposing pads. At least one of the electrodes is electrically connected to one of the opposing pads and the remaining electrodes are electrically connected to the other opposing pad. The sequence of the three electrodes is unevenly distributed with respect to which of the pads the electrodes are connected to. At least two additional groups of at least three electrodes similar to the first group have sequences of electrodes within each group that is distinct from the other groups.

Abstract: A surface wave device includes a substrate (12 in FIG. 7) having a surface layer of piezoelectric material (14), at least one pair of opposing electrically conducting pads (16 and 18) and at least two electrodes (20 and 22) which generate surface waves that vary significantly in strength in a direction transverse to the opposing pads. An ungrounded pad (16) forms an electrode array of parallel segmented electrodes (24), joined by electrically conducting connecting bars (26), having more segmented electrodes near the center of the transverse distance than near the pads. A grounded electrode (22) forms a segmented electrode array having segmented electrodes (44) joined by electrically conducting connecting bars (46) having fewer segmented electrodes near the center of the transverse distance than near the pads.

Abstract: Disclosed is a mounting housing for leadless chip carriers for use on burn-in boards, circuit boards and the like. The housing includes an insulating base support containing a plurality of electrically conductive axially elongated bodies extending therethrough arranged to define a rectangular cavity in a plane parallel with the first major face of the base support. The ends of the axially elongated bodies defining the cavity have edges inclined inwardly toward the cavity and edges inclined outwardly from the cavity. A spreader mounted for reciprocal movement axially with respect the elongated bodies has an inclined surface mating with the outwardly inclined edges of the elongated bodies so that movement of the spreader moves the inwardly inclined edges outwardly to permit insertion of a leadless chip carrier within the cavity.

Abstract: Food frying and dispensing apparatus is disclosed which is housed in a supporting cabinet and includes a device for holding a supply of cooking oil and a heating device for maintaining the temperature of the cooking oil sufficiently high for cooking successive batches of food products introduced into the oil by a food support basket. A fan assembly exhausts air through the top of the cabinet. A derated precipitator, a charcoal filter, a fragrance holding apparatus and an ozone generator are positioned upstream of the fan assembly and in the path of air flow to eliminate any smoke or odor produced within the apparatus prior to discharge of the air from the cabinet. Food handling apparatus pivotally positions the food support basket in three separate and distinct positions with the three positions being in the cooking oil in a "cook" position, out of the oil in a food product "dispense" position and out of the oil in a "ready" position.

Abstract: Disclosed is apparatus for removeably mounting on small firearms to assist in marksmanship training. The apparatus includes a lamp and lamp firing circuit activated by a switch moveable between first and second positions by an elastic band coupled between the switch and the hammer of the firearm. The circuit is arranged to charge a capacitor when the hammer is cocked and uses the energy stored in the capacitor to switch a transistor to temporarily connect the lamp to a battery when the firearm is fired.

Abstract: A plenum unit (10) for adapting roof construction for a prior rooftop air conditioning unit for use with a new air conditioning unit (12) is disclosed. A plenum (20) mounts on curbing (14) of the prior air conditioning unit. A partition (26) separates a supply chamber (22) from a return chamber (24), and an adaptor plate (28) is affixed to the plenum for mating the plenum unit with the new air conditioner unit. In one arrangement, the partition has a fixed portion and a movable portion to adjust for different size adaptor plate openings. Adaptor plates are interchangeable so that the plenum can be used with different types and sizes of new air conditioning units. In one arrangement, the ratio of intake air can be adjusted between return air from the return duct opening and fresh from the outside.

Abstract: Disclosed are methods and apparatus for rinsing soluble materials from the filter cake formed in a double belt press. The belts with the filter cake therebetween are suspended between two spaced apart rollers to relieve pressure on the filter cake and the filter cake is simultaneously exposed to a rinse medium. Pressure is thereafter re-applied to the filter cake to extract the rinse medium therefrom.

Abstract: Swivel connector apparatus for use in connecting lines together which carry a pressurized fluid and which require relative rotation therebetween is disclosed which includes an outer body having a bore formed axially therein which extends entirely therethrough. An inner body is configured for an interfitting relationship between a first portion thereof and the bore of the outer body which includes three bore portions. The inner body includes a bore formed axially therein which extends entirely therethrough. The first portion of the inner body is provided with a predetermined number of annular cavities on the outer surface at predetermined locations. Sealing means and radial bearing means are positioned in predetermined annular cavities of the first portion of the inner body and are in engagement with the first portion of the inner body and the bore of the outer body.

Abstract: Method and apparatus for the generation of low frequency acoustic energy such as may be employed in carrying out seismic surveys in marine environment. In imparting an acoustic energy pulse into a body of water, a planar electroacoustic transducer having parallel transducer plates is employed. The transducer plates have conforming electrical conductive paths. An impulse of opposed current flow is applied to the conductive paths to produce an electromagnetic field between the conforming paths which forces the transducer plates apart, generating an acoustic impulse having a center band frequency of less than 350 hertz. The wave length of the acoustic impulse at this frequency is less than twice the major planar axis of the transducer. The conductive paths may be formed of elongated conductors which are oblong in cross section and cover most of the radiating surface of the transducer.

Abstract: Apparatus and method are disclosed for measuring and displaying predetermined characteristics of reciprocating piston machines. In the preferred embodiment, the predetermined characteristics comprise indicated horsepower, crankshaft angle and piston position. The apparatus comprises a central processing unit, memory devices, keyboard assembly, display controller, display unit, sweep generator, pressure data acquisition and scaling system, shaft encoder and pressure transducer operatively connected by an address bus and a data bus to measure and display the predetermined characteristics. A method is provided whereby an electrical signal is generated which is proportional to the instantaneous position of a designated piston in the reciprocating piston machine.

Abstract: A surface wave resonator device (10) includes a substrate (12) having a surface layer of piezoelectric material (14), first and second reflective grating structures (16 and 18) and a middle grating structure (40). The middle grating structure includes an odd multiple of one-quarter wavelength for the resonant frequency of the first and second reflective grating structures. The surface acoustic wave transmission velocity of the middle grating structure is substantially equal to the surface acoustic wave transmission velocity of the first and second reflective grating structures. One arrangement includes a surface acoustic wave input transducer (52) and a surface acoustic wave output transducer (58).

Abstract: A floor panel for use in elevated floor assemblies is disclosed which includes a core member, a top sheet and a bottom sheet positioned on opposed sides of the core member and a flexible edge member operatively positioned between the top and bottom sheet. The bottom sheet has an upwardly deflected edge which forms a first shoulder. The top sheet includes a central section, an edge section and a connecting section operatively connecting the central section to the edge section. The edge section is positioned inboard of and below the first shoulder and forms an opening therebetween. The flexible edge member includes a portion which extends through the opening and an outer shoulder which engages the first shoulder. Edge member also includes an inner groove which is configured to receive the edge section therein.

Abstract: A differential pressure-responsive apparatus is disclosed which includes a primary base plate member, a cover member removably attached to the primary base plate and thereby forming a normally closed chamber, a bellows and range spring module removably attached to the primary base plate within the chamber and including a secondary base plate member, a bellows apparatus with one end thereof removably fixed to the secondary base plate and having an opposite normally closed movable end thereof movable in response to varying differential pressure thereacross, said bellows apparatus dividing the chamber into separate inner and outer chamber portions, and a first, normally closed, one-way opening valve in the normally closed movable end of the bellows apparatus, operable for interconnecting and disconnecting the inner and outer chamber portions of the apparatus with the first valve interconnecting the inner and outer chamber portions when the differential pressure therebetween exceeds a predetermined value in a fir

Abstract: Ultrasonic cleaner apparatus is disclosed which includes a support housing, a cleaning tank supported by the housing and a transducer device physically attached to the bottom of the cleaning tank. A basket is configured to be capable of insertion into the cleaning tank. The basket includes a rim portion which rests on the support housing and maintains the bottom of the basket a predetermined distance above the bottom of the cleaning tank. The basket includes a predetermined number of cylindrical housings which are vertically oriented and are positioned around the inside of the basket. The cylindrical housings are configured to receive technical pens therein. A liquid level post projects upwardly from the bottom of the basket. Apertures in the bottom of the basket and the cylindrical housings allow cleaning solution and ultrasonic waves and energy to be transferred back and forth between the inside of the basket and the cleaning tank.

Abstract: A leveling and locating or positioning device is disclosed which includes a force-bearing structure which is guided for vertical leveling movement by a vertical reference device which also provides a horizontal position reference. Horizontal movement of a tapered wedge device, which operatively interfaces with a sloped floor member of the force-bearing structure, causes vertical movement of the force-bearing structure and the resulting leveling function. A horizontal extender device, slidably mounted to and supported by the force-bearing structure, provides the horizontal locating or positioning function. A support device is operatively included or mounted to one end of the horizontal extender device and is configured to operatively interface with the member or device which is to be leveled and located or positioned.