Abstract: A seal for use in a cylindrical groove in a cylindrical item positioned in a cylinder such as a rotary valve where the seal is subjected to reciprocating forces as the item and the cylinder rotate with respect to each other. The seal has two adjacent pairs of outer sealing rings with each pair being backed up by a pair of backup rings which are positioned to bear outwardly on the sealing rings. A spring is positioned to push the pairs of sealing rings and the associated backup rings to the opposite sides of the groove to form the side seals and hydraulic pressure is provided underneath the rings to urge them outwardly to form the outward seal.

Abstract: A speaker grille bezel-retainer terminating in a tubular portion with multiple groups of radially intermittent serrations axially displaced to receive a matching bezel ring having an inside diameter with alternate tabs and cut-outs and the tab is shaped to form a ramp to axially advance the ring on the bezel while rotationally engaging spaced, aligned pairs of serrations.

Abstract: TV playback apparatus and method for a record having track sets comprising video track analogs and a plurality of audio track analogs disposed between the video tracks. All tracks in a respective track set are sensed for playback by a movable reading head incorporating a combination of video and audio sensing elements and including tracking of homing elements flanking the video reading element. A track set switching signal is sensed from the audio signal by an audio reading element for a controller means which very quickly slews the reading head to roughly position the video reading element for next video track. Such video track is sensed by any reading element in the reading head and determined through a multiplexer and controller means. Reading head is further stepped as necessary until video track sensing element is reading video track as controller receives video signal through band pass filter video sensing element.

Abstract: A process and apparatus are provided for producing singlet molecular oxygen, O.sub.2 (.sup.1 .DELTA.). A nitrogen containing base such as NH.sub.3, diethylamine, ethanolamine, propylamine, triethylene diamine, phenethylamine, methyl amine, or dipropylamine is mixed with hydrogen peroxide. Chlorine gas is bubbled through the mixture which reacts therewith to produce singlet molecular oxygen. A preferred embodiment of the reaction is illustrated by the following example:2RNH.sub.2 +H.sub.2 O.sub.2 +Cl.sub.2 .fwdarw.O.sub.2 (.sup.1 .DELTA.)+2RNH.sub.3 Clwhere RNH.sub.2 is an amine.The apparatus for producing the singlet molecular oxygen is a reactor vessel with the hydrogen peroxide and nitrogen containing base solution as a liquid mixture in the bottom thereof through which chlorine gas is bubbled. The vessel is maintained at a pressure range of 1 to 20 Torr, a temperature range of -30.degree. to 35.degree. C., a pH range of 7 to 12, and the O.sub.2 (.sup.1 .DELTA.

Abstract: An improved card for use in an automated machine to detect the continued existence of microbes in a plurality of wells containing different media so that the organism can be speciated. The card includes an improved configuration wherein the wells have different reduced oxygen environments and all of the wells have an improved bubble chamber connected to the well by a bifurcated passage.

Abstract: A laser diode is soldered between metal plates for intimate thermal and electrical contact. The plates are prefabricated and are provided with an insulated spacer therebetween. The two metal plates are held together in a preferred orientation by the spacer which is firmly adhered and sealed to the two plates during the diode soldering operation. The laser diodes so mounted can be tested in this configuration and after testing are formed into an array by stacking the laser diode subassemblies providing spacer elements therebetween and series contacts from one end to the other of the array so that an array of laser diodes with matched characteristics can be constructed in a line which may not be in alignment with the total package to provide an intense light output at a predetermined wavelength.

Abstract: This photovoltaic cell in a principal embodiment comprises a P-type substrate having an unshadowed first surface adapted to receiving incident radiation and a second surface which contains at least one ohmic contact and at least one metal-insulator-semiconductor contact, this structure thereby forming a back contacted minority carrier MIS cell.

Abstract: Crescent distortion of output samples collected during a continuous free flow electrophoresis separation process is reduced by providing means with the electrophoresis chamber whereby lateral flow across the chamber may be controllably varied to introduce beneficial hydrodynamic compensation effects to minimize distortion of the sample streams within the electrophoresis chamber.

Abstract: The structure and the process for making a metallic sandwich structure in which metal worksheets, preferably made from titanium alloy, are joined in a preselected pattern by an intermittent or discontinuous weld. The joined sheets are sealed by a continuous weld to form an expandable envelope. Application of inert gas pressure to the envelope in a limiting fixture superplastically produces the sandwich structure as the expanded structure diffusion bonds to itself or other worksheets. Core configuration of the structure is determined by the intermittent weld pattern. Face sheets of the sandwich structure may be formed from one sheet of the envelope or may be inserted in the limiting fixture and the envelope expanded against the face sheets. Additionally, the face sheets may be preformed or formed concurrently with the core to produce the desired core and sandwich shape in a single operation.

Abstract: A beam of light is split and introduced into different ends of a light path whose rotation is to be sensed. At least one frequency shifter is placed in the light path to affect the frequency difference of the two beams so as to introduce or adjust a nonreciprocal phase shift. The beams are then mixed back together and the resultant beam is detected and analyzed by suitable circuitry to provide an output indicative of rotation of the light path.

Abstract: A linear fluid actuator having two pistons and two cylinder chambers in tandem to provide redundancy when supplied from independent pressure sources. The actuator is balanced in that the actuator output force is equal in extend or retract positions. The two cylinder chambers are made from separate housings to prevent crack propagation between the chambers and dual piston rod construction is provided to enhance redundancy.

Abstract: A hydraulic actuator cylinder primarily for the actuation of aircraft landing gear in which the rod end is made integral with the piston rod with the attaching threads positioned inside the cylinder. The piston head is designed to float on the piston rod plus or minus the amount of adverse tolerance conditions that are possible in the landing gear installation.

Abstract: A seal structure for use in high pressure pneumatic or hydraulic fluid actuators. A solid toroidal shaped elastomeric O-ring and a solid toroidal shaped backup ring are emplaced in a specially configured circumferential groove on an internal sleeve. A conical shaped ramp in the groove bottom permits the use of a solid backup ring with a larger internal diameter for ease of installation over intervening lands on the sleeve without distortion of the backup ring beyond its elastic limit. The difference in the sizes of the symmetrical O-ring and backup rings assist in their proper installation on the sleeve.

Abstract: An aircraft brake which is circumferentially disposed about the aircraft axle and supported at two points symmetrical about a line perpendicular to a center line drawn through the aircraft axle. Clearance between the brake housing and the axle in the direction of the reacting couple to the braking load is essential in the geometry of mounting the brake to the shock strut and axle structure.

Abstract: A vibrating electret reed voltage generator. The reed vibration is induced by fluid pressure supplied to the reed chamber and controlled through a fluid oscillating circuit.

Abstract: Tooling for use in an autoclave or a hot press for the superplastic forming and diffusion bonding of metals which tooling includes upper and lower portions with a labyrinth seal therebetween having inert counterflowing gas introduced thereto to prevent contamination from flowing across the seal to attack the metal being processed.

Abstract: A multi-piston motor pump for the transfer of hydraulic energy from one hydraulic system to another without the transfer of fluid therebetween. A plurality of pistons are maintained in predetermined phase by a nutator mechanism or spider which is then used to rotate a shaft connected to valving means for the pistons which controls fluid to, or away from the pistons in a predetermined manner. The motor pump unit, in large measure, is made possible by improved couplings between the spider and the pistons that provide complete motion freedom, yet maintain definite position between the pistons and the spider. In addition, a rotary valve arrangement is disclosed which reduces the start-up friction loads of the unit to a minimum while being relatively reliable and easy to mechanize.

Abstract: A drill for use on reinforced composite parts comprising a two fluted marginless drill body with four forward cutting edges, said edges first scribing a hole in the composite and then cutting the plug from the circumference of the hole inward to the axis of the hole.

Abstract: A laser diode suitable for integrated and fiber optic applications requiring single transverse and single longitudinal mode operation. The single transverse mode is provided by making a gallium arsenide double heterostructural laser diode with a narrow stripe width and a relatively long length. The single longitudinal mode operation is provided by cracking the diode transverse to the stripe at one or more locations to form internal etalons in the laser cavity.