Abstract: Binder solution for preparing sand cores of initial high strength but with essentially no strength after casting metals above 700.degree. C., said binder solution comprising an aqueous solution of sodium, potassium or lithium silicate having an overall molar ratio of SiO.sub.2 /alkali metal oxide from 3.5:1 to 10:1, and containing sufficient amorphous silica so that the fraction of the total silica in the binder solution which is present as amorphous silica is from 2 to 75%, the amorphous silica having a particle size in the range from about 2 nanometers to 500 nanometers.

Abstract: A combination wallet and badge holder is provided the inside of which has a badge-mounting panel with a specially constructed badge covering flap thereover which conforms to the contours of the badge and both protects a vinyl I.D. window on the other side of the wallet from the abrasive nature of the badge and also conforms sufficiently closely to the contours of the face of the badge to enable the user to show his identification for purposes of cashing checks and the like without revealing the badge.

Abstract: Plant parasitic nematodes are controlled by ureidosulfenyl carbamates such as 2-(dimethylamino)-N-[[N-methyl-N-[N-methyl-N-(2-propynylaminocarbonyl)amin othio]aminocarbonyloxy]]-2-oxoethanimidothioic acid, methyl ester.

Abstract: Vulcanizates of certain fluoroelastomer terpolymer compositions, wherein the terpolymer is derived from tetrafluoroethylene, perfluoro(methyl vinyl ether), and a cure-site monomer, and further wherein the composition contains non-black filler, exhibit significantly improved stability upon heat aging when small quantities of quinacridone-type pigments are incorporated therein.

Abstract: Carboxylic ester and acyl fluoride groups are interchanged in the presence of a metal fluoride catalyst or a metal fluoride/strong sulfonic acid catalyst combination to produce fluorinated mono- and diacyl fluorides.

Abstract: A heat exchanger including a first piece of heat conductive tubing wound in a helical configuration defining a plurality of first helical flights having an outboard portion thereon and a second piece of heat conductive tubing wound in a helical configuration defining a plurality of second helical flights having an inboard portion thereon where the first and second helical flights are arranged so that the outboard portions of the first helical flights are in heat conducting contact with the inboard portions of the second helical flights and where the first and second helical flights have been formed by forcing the outboard portions of the first helical flights and the inboard portions of the second helical flights together so that the portions are forced into heat conducting contact with each other. The disclosure also describes the method of manufacturing the heat exchanger and the method of operating the heat exchanger.

Abstract: Triazolone herbicides of the formula: ##STR1## where V is hydrogen, fluorine, chlorine, bromine, methyl or OR where R is alkyl of 1-4 carbon atoms;X is hydrogen, fluorine, chlorine, bromine, cyano, methyl, methoxy, or nitro;Y is hydrogen, fluorine, chlorine, bromine, or methyl;n, m is 0, 1, 2, 3 or 4;Q is oxygen or sulfur;Z is oxygen, S(O).sub.p or NR';p is 0, 1 or 2 andR' is alkyl of 1-3 carbon atoms with the provisos that(1) n+m=2, 3, or 4; and(2) if n+m=2 or 4 then Y, X.noteq.Hand when Z is S(O)p, n is 1, 2, 3 or 4.

Abstract: A process for the preparation of 2,2'-azobis (2,4-dimethylpentanenitrile) with improved filtering and drying characteristics, said process comprising reacting 2-amino-2,4-dimethylpentanenitrile with a metal hypochlorite in the presence of water, a mixture of quaternary ammonium surface active compounds and ionic bromide wherein the equivalent ratio of ionic bromide to surface active compound is 0.4:1-12.0:1 at a temperature of about -10.degree. C. to about 30.degree. C., and recovering 2,2'-azobis(2,4-dimethylpentanenitrile) from the reaction mixture.

Abstract: A vacuum cleaning machine comprising a hood forming a traveling vacuum chamber with an optimum combination of suction nozzle means and jet stream means for projecting a plurality of individual jet streams at a flat angle with the surface that is to be cleaned. A low ceiling plate is positioned between the suction nozzle means and the jet stream means so as to restrict the effective volume of the area that is acted upon by the jet stream means and the suction nozzle means. Associated with the low ceiling plate are a plurality of vertical partitions which divide the area into a series of narrow wind tunnels connecting the jet stream manifold to the intake of the suction nozzle means. A motor driven compressor is positioned above the low ceiling plate and provided with a conduit to deliver a compressed fluid to the jet stream manifold.

Abstract: A composition having reduced gate smear is obtained from a selected polyamide, calcined calcium silicate and a selected toughening agent.

Abstract: Nuclear magnetic resonance (NMR) apparatus have beenproposed for examining slices or volumes of bodies, perhaps for medical examination of patients. Magnetic fields are used to induce resonance in a selected region of a body and a resonance signal is detected during a pulse of a gradient field which causes phase dispersion across the region.It is now proposed that more efficient operation of the apparatus is possible if the gradient pulse is a non-square pulse, perhaps a distorted sinusoid, and the resonance signal is sampled during that pulse at intervals such that .intg. Hdt is substantially equal between adjacent samples.

Abstract: A centrifuge rotor is described which facilitates the preparation of cell dispersions on microscope slides. The rotor is bowl-like in configuration and defines plural peripheral regions adapted to receive the slides and a removable sample chamber associated with each slide. Each chamber has an outlet adpated to contact its slide. A sample, containing blood cells, for example, may be placed in a chamber and the cells centrifugally sedimented against the slide associated therewith. Excess or unwanted fluid is removed from the chamber by applying a vacuum through a vacuum line and hollow drive shaft. Leaf springs maintain each chamber in position and the vacuum line in fluid contact with the chamber. The vacuum line conecting each chamber cooperates with its leaf spring such that if a chamber is missing, the leaf spring closes the vacuum line.

Abstract: A method of continuously forming a mophead is disclosed for making a non-woven fabric mophead of a cellulose and synthetic resin fiber blend by sealing and cutting the non-woven fabric including:(a) combining a plurality of non-woven continuous fabric sheets together in a composite superimposed stack;(b) intermittently moving the superimposed stack to a sealing station and forming at least one ultrasonic seal transverse to the length of the sheet and in the center area of the superimposed stack;(c) intermittently moving the superimposed stack to a cutting station; and(d) dividing the superimposed stack into mophead widths and simultaneously cutting a saddle portion and plural strips.

Abstract: A damper control system wherein a control screw is threadedly mounted in a door and engages a depending contact arm on a damper to move the damper between a closed position and various open positions.

Abstract: The invention relates to new compounds useful as hypotensive agents, of the formula: ##STR1## wherein R is hydrogen or lower alkyl;R.sub.1 is hydrogen, lower alkyl or halo substituted lower alkyl;R.sub.2 is hydrogen, ##STR2## or ##STR3## R.sub.3 is lower alkyl, phenyl or phenyl lower alkyl; Pr--COOR is a substituted or unsubstituted proline.

Abstract: A tap, particularly for drinking fountains, has a plunger 17, operated by a toggle 24 and carrying a compressible valve member 19. The valve member 19 cooperates with a seat 16. In order to simplify replacement of the compressible valve member 19, the seat 16 is formed on a receivable carrier 11 which is sealingly and slidably mounted in the valve body and is removable with the plunger when the locking ring 12 is removed.

Abstract: An apparatus that measures light transmitted through a fluid sample and provides a direct readout of such a measurement by electronically converting light transmitted to an electrical signal that is displayed on a readout device; the apparatus contains a power source, a light source, a photodetector, a sample holder for samples that forms a cell; the improvements used in the apparatus are as follows:(a) a color interference filter positioned between the sample and the photodetector which filters out unwanted bands of color,(b) a converter which electronically converts a current signal from the photodetector to a voltage signal,(c) a logarithmic response circuit that changes the voltage signal to a logarithmic signal proportional to the logarithm of the voltage signal; and(d) a digital voltmeter that converts the logarithm signal to a signal that is displayed on a readout device.

Abstract: A rotary dry shaver comprising a component housing, a pair of tiltable cutting elements with exposed apertured shear plates, a bladed rotary cutting member cooperative with the inner surface of the shear plates and coactively tiltable therewith, a driving shaft for the cutting members, the shear plates and cutting members normally disposed at a right angle to the shaft axes, the cutting elements independently supported axially on a spherically radiused surface whereon they are freely tiltable at diverse angles relative to the shaft axes, a removable cutting element retaining frame with apertures through which a portion of each of the cutting elements projects, the outer surface of the projecting portion correspondingly spherically radiused and fittingly and tiltably retained by and in the frame apertures, a chamber in the housing beneath said frame to receive hair clippings, apertures through the housing sidewalls communicating with the chamber, hinged side plates to open and close the wall apertures, the sid