Abstract: An operational amplifier is disclosed having a phototransistor at its input for reading a bar code wherein the saturation point of an operational amplifier is controlled by a clamping feedback voltage having a positive control controlling the saturation point of the operational amplifier while prohibiting the operational amplifier from reaching its saturation point.

Abstract: A multiple deck screening machine wherein the feed material is divided into separate equal fractions on a rubble screen deck and scalp screen decks. Each deck includes downwardly slanting distribution panels having serrated lower edges. Particulate flow over the serrated edges is divided into separate fractions. Each adjacent fraction passes into a different parallel vertical channel which serves a particular screen deck via a chute. The chutes and channels extend the full width of the screens. Flow across the serrated edges is separated due to the notches and tongues and upstanding dividers along the common edge to each notch and tongues. Each notch and tooth of the rubble screen deck is disposed in juxtaposition to an opposed tongues and notch respectively so that excess flow over a tongues may pass over its channel into the channel of the opposed notch. The rubble screen deck including a pair of downwardly and inwardly inclined distribution panels which oppose each other and define a flow gap therebetween.

Abstract: A portable scale for weighing animals and the like. A weighing platform is suspended on top of two floating crossbar assemblies which are pivotally mounted to opposing edges of a rectangular wheeled base. Each crossbar assembly includes a lever member extending across the rectangular base toward the other lever. The levers are pivotally linked together at the center of the rectangular base such that weight applied to either crossbar assembly from the platform is transmitted to one of the levers which extends beyond the rectangular base. Downward motion of such lever is converted to a weight by a balance or load cell weighing mechanism. A weighing enclosure or basket is provided on top of the platform to confine animals therewithin during weighing.

Abstract: A fastener striking apparatus for fasteners, especially for staples, nails, etc., comprising a housing with a plunger to be struck arranged therein, a tool portion arranged at the housing containing a fastener channel with the plunger guided therein during the striking operation, and a magazine for the fasteners with the fasteners advanced therein with the aid of a spring-biased feeder in the direction of the fastener channel, with an adjustable resetting member provided which when in the normal position has a cam projecting into a recess formed in the tool portion on the side of the fastener channel opposite the magazine and which upon adjustment against the feeding direction of the fasteners in the magazine is adapted to be adjusted to such an extent that the respective foremost staple, together with the cam is disposed outside the fastener channel.

Abstract: In-the-ear type hearing aid devices having means for receiving and amplifying sound external to the ear are improved by the addition of a handle which aids in the removal of the device from an ear. The handle includes an elongated member which is preferably hingedly mounted to the faceplate portion of the hearing aid device. The free end of the elongated member is enlarged and may be grasped by a hand to facilitate removal of the device from an ear. Preferably, the device includes cooperating detent members which normally holds the handle in a closed, minimally projecting configuration.

Abstract: This invention is directed to an optical card reader in which the cards to be read have a format arranged in columns and rows. A row of timing marks or slots is formed in the card for each column of data. The card is driven past a read head block that directs the light to the card in which the reflected light is received through a shaped aperture or orifice so that a positive indication of the marked area is detected. The signal is applied to an operational amplifier for further treatment. There are a plurality of light sources and sensors transversely arranged in the read head block.

Abstract: A constant temperature anemometer having an enhanced frequency response. A sensor element is included within one leg of a bridge circuit with a feedback circuit being operatively connected to the bridge circuit. The bridge circuit frequency response is shaped by impedance elements connected in parallel with another leg of the bridge circuit. In a preferred embodiment, the impedance elements include serially connected resistance and capacitance elements.

Abstract: A transverse concrete pavement joint cell including a pair of plastic walls abutting the edges of the concrete joints. A seamless drainage gutter extends longitudinally between said plastic walls to the edges of the pavement. Blocks of compressible elastomers between said plastic walls absorb expansion of the concrete. The cell includes a base and stabilizing ties secured to a conventional dowel bar assembly.

Abstract: A dialyzer reuse machine comprising means for passing a series of liquid and gaseous fluids through the dialysate and blood compartments of the dialyzer at different flow rates according to a predetermined sequence for cleaning and disinfecting the dialyzer and means for accurately measuring the volume of the blood compartment upon completion of the dialyzer cleaning steps. Capacitive probe and load cell embodiments of the volume measuring means are disclosed. A specially designed jet pump permits a pressure leak test and dilution of stock chemicals to be performed using only tap water pressure as a source of motive force.

Abstract: Hyaluronic acid, a polysaccharide, is prepared in high yield from streptococcus bacteria by fermenting the bacteria under anaerobic conditions in a CO.sub.2 -enriched growth medium, separating the bacteria from the resulting broth and isolating the hyaluronic acid from the remaining constituents of the broth. The bacteria may be grown free of endotoxins by filtering all ingredients through a 10K Millipore.RTM. filter prior to inoculation of the medium and subsequently maintaining pyrogen-free conditions. Separation of the microorganisms from the polysaccharide is facilitated by killing the bacteria with trichloroacetic acid. After removal of the bacterial cells and concentration of the higher molecular weight fermentation products, the hyaluronic acid is isolated and purified by precipitation, resuspension and reprecipitation.

Abstract: A single-piece plastic shotshell casing and method of making same comprising softening one end portion only of a tube of uniformly biaxially oriented high density polyethylene sufficiently for forming and until a dollup is formed, then telescoping only a portion of the dollup into the rigid sidewalls of the tube, and then forming the dollup into a substantially thickened integral transverse base section constituting a head with a longitudinally extending primer opening therein, the base section being substantially biaxially oriented and the rigid sidewalls terminating a substantial distance inwardly from the outer end of the base section.

Abstract: A cationic electrodeposition composition comprising the reaction product of one or more base alkyds, containing unsaturation of the fatty acid chains to provide oxidative curing and one or more ethylenically unsaturated monomers, and one or more amine functional monomers, which are added to the base alkyd and polymerized. This composition provides a vehicle which is hydrolytically stable. Paints are prepared by the addition of conventional driers, pigments and solvents to the vehicle composition.