Abstract: A seven-segment display provides a set of eight lamps for each category of a test sample (such as bacteria) to be identified by the device. Manually operated electrical switches are used to enter and store the results of a plurality of tests (such as biological tests) into the device. Logic circuitry responds to the positions of the switch to control the lighting of individual lamps in the sets for the categories which have a significant positive correlation to the results entered by the switches. The display for which the greatest number of lamps in the most significant positions are lighted represents the category of the test sample being tested.

Abstract: An electrical device having arc-prone electrical contacts within a container and an arc-resistant dielectric halogenated gas within the container. Also within the container is a filled resin electrical insulator. The filled resin comprises a cured epoxy resin and a filler of particles of calcium-aluminum glass.

Abstract: A modified N,N'-substituted 2,4,5-triketoimidazolidine containing polycarboxylic acid amide or imide groups at least in the main chain, a process for its manufacture which comprises reacting at a temperature of from minus 20 to plus 280.degree. C (a) at least one oxamidic ester having the group --NH--CO--CO--OR.sup.v, wherein R.sup.v is an aliphatic hydrocarbon group having up to 18 carbon atoms, a cycloaliphatic hydrocarbon group with up to 8 carbon atoms, a mononuclear aromatic hydrocarbon group which may contain at least one hydrocarbon group which constitutes a total of up to 14 carbon atoms (b) at least one isocyanate having or yielding 1 to 4 isocyanate groups or isocyanates forming compound and (c) a polybasic carboxylic acid component having 4 to 71 carbon atoms and 2 to 6 carboxylic groups so as to obtain a condensation product possessing amide or imide groups.

Abstract: An epoxy resin containing acetoacetic ester groups in which at least a part of the acetoacetic ester groups is enolized by atoms of at least one metal from groups I to VI or Ia to Viiia of the Periodic Table according to Meyer and Mendelejeff which metal atoms are partially bound to the enolic oxygen of the acetoacetic ester group in the form of a chelate. A process for preparing said resins wherein an epoxy resin product containing acetoacetic ester groups is further reacted in the presence of a solvent (a) first with an alkali metal alcoholate and subsequently with at least one salt of at least one chelate-forming metal; or (b) with at least one chelate-forming metal in the presence of a tertiary amine or (c) for the preparation of an epoxy resin containing chemically bound atoms of at least one metal partially bound as a chelate an epoxy resin containing acetoacetic ester groups is further reacted in the presence of a solvent with an alcoholate of at least one chelate-forming metal.

Abstract: A process for grafting polymers on carbon black through a free radical mechanism comprising contacting of the black with the polymer and a thermal treatment.After formation of the carbon black mixture with at least one polymer, said mixture is degassed under vacuum at approximately room temperature, at least one substance acting as a solvent for said polymer is then introduced on said degassed mixture which is under vacuum, so as to form a solution of the latter containing the carbon black, said solution is heated with stirring at least at 50.degree. C until a carbon black bearing polymer grafts is obtained and the latter can, if desired, be separated by filtration or centrifugation of the unattached polymer solution.The carbon black products bearing polymer grafts as well as this carbon black itself are easily dispersed in solvents. They find valuable applications in paints, varnishes, printing inks, among others.

Abstract: A process for the preparation of a flexible phenolic resin which comprises co-condensing a dimethylol phenol, substituted by an alkyl group having from 1 to 20 carbon atoms, with a methylol derivative of a polyfunctional phenol in which derivative at least half of the reactive hydrogen atoms in the polyfunctional phenol are substituted by methylol groups and wherein the ratio of the methylol groups of the derivative of the polyfunctional phenol per mol of the dimethylolalkyl phenol is from 1.4:1 to 6:1, a phenolic resin prepared by said process, a coating composition containing said phenolic resin and an article coated with or comprising said phenolic resin.

Abstract: A resinous composition containing as an essential ingredient a binder comprising a product obtained byI. reacting in a first stage a solution of1. a copolymer containing anhydride groups with2. at least one alcohol containing up to 2 hydroxy groups to yield a reaction product wherein the anhydride groups are at least partially converted to semiester groups, andIi. reacting3. the product thus obtained in the presence of water at a temperature in the range from 50.degree. to 120.degree. C with4. a salt-forming compound of a polyvalent metal, the solvent present in the first stage of the reaction being compatible with said alcohol and partially miscible with water only to such an extent that two phases are formed therewith together with at least one pigment and an aromatic hydrocarbon as a solvent.

Abstract: A new process for the preparation of hardenable phenolic resins which are substantially free from unreacted phenol and unreacted formaldehyde and which liberate at most only trace quantities of formaldehyde on hardening comprises reacting novolaks containing methylene bridges which are substantially free from unreacted phenol with formaldehyde in the presence of from 0.15 to 1 equivalent (based on the number of phenolic hydroxy groups) of a basic catalyst at 20.degree. to 70.degree. C. The phenolic resin products may be used wherever conventional phenolic resins have previously been used, an important application being the preparation of aqueous emulsions for use as coating materials and impregnating agents.

Abstract: Signal processing techniques and apparatus for use in short-pulse geophysical radar systems to improve signal-to-noise ratio, reduce r.f. interference, improve resolution and reduce ambiguities.

Abstract: Articles containing active proteins, such as enzymes, crosslinked to an inactive protein are prepared by dispersing and reacting in a solvent an active protein and an inactive protein simultaneously with a crosslinking agent to crosslink the active and inactive proteins together. The degree of crosslinking can be controlled by introducing tris (hydroxymethyl) aminomethane in an amount sufficient to stop chain growth. Optionally, an inert carrier may be present during crosslinking. The resultant crosslinked active and inactive proteins can be in various forms such as solutions, suspensions, gels, films, membranes, granules, pills or tablets.

Abstract: An electrical connector for connecting corresponding electrically conductive areas on two spaced-apart surfaces positioned on opposite sides of the connector comprises a resilient, electrically non-conductive sheet of elastomer having first and second parallel faces and a plurality of from 2,500 to 40,000 electrically conductive linear elements per square inch of area of the faces. The linear elements are distributed substantially evenly throughout the sheet of elastomer, are bonded to the elastomer, and rectilinearly extend between the two faces. Each linear element is electrically insulated from each other linear element within the elastomeric sheet while the plurality of linear elements constitutes less than 10% of the volume of the combination of linear elements and elastomeric sheet.

Abstract: A getter device of the annular-ring type having a deflector. The deflector has a conical segment and both axial and radial locating elements. The radial locating element is U-shaped in cross section.

Abstract: A tricycle having unique rear-wheel suspension means is provided. The rear-wheel suspension means includes a rear frame rotatably bearing two rear wheels. The rear frame is disclosed with a connection shaft perpendicularly thereto substantially at its central portion. The connection shaft is rotatably inserted into a cylindrical boss which is provided adjacent to the end portion of the main frame of the tricycle such that when the connection shaft is inserted into the boss and when the tricycle is normally put on the ground, the extension of the axis of the shaft passes through a certain point below the ground contact point of the front wheel.

Abstract: A color television signal is divided into a luminance signal component Y and two color difference signal components R--Y and B--Y. In differential pulse code modulation for transmission and demodulation after reception, the color difference signals are coded and decoded in a time multiplex mode respectively by a single coder and a single decoder.

Abstract: A process for producing a cotton batt by forming a thin web of cotton fibers and then contacting the web with particles of a copolymer of vinyl chloride and vinylidene chloride; subsequently forming the web into a batt and then heating the batt.

Abstract: A multi-conductor probe, having a probe end adapted to contact a body to be probed, consists of a first element of electrically insulative elastomer and a plurality of elements of electrically conductive elastomer contiguously bonded to the first element such that each of the electrically conductive elements is insulated from any other of the electrically conductive elements. Each of the electrically conductive elements is electrically connectable to an external electrical test means at a point remote from the probe end. The electrically insulative element and the electrically conductive elements are substantially coterminous at the probe end.

Abstract: A process for the preparation of light color, odor free novolaks which have high melting points, high condensation levels, good solubility and uniform compositions which comprises reacting in at least one stage a) at least one alkyl-free phenol, b) at least one condensation product of formaldehyde and at least one alkyl phenol, the said condensation product containing at least one member selected from the group consisting methylol groups and methylene ether linkages, and c) less than one mole of formaldehyde calculated on the basis of the total number of moles of phenol and alkyl phenol present and including the formaldehyde already present in the alkyl phenol-formaldehyde condensation product, in the presence of an acid catalyst, such that the ratio of the product of (moles of alkyl phenol .times. number of carbon atoms in the alkyl radicals of the alkyl phenol)/(the total molar number of phenolic hydroxy groups in the starting materials) is from (0.6 to 1.

Abstract: A process for the isomerization of an ester of an alcohol having 1 to 12 carbon atoms and an fatty acid having 10 to 24 carbon atoms and isolated double bonds to the corresponding compound having conjugated double bonds which comprises isomerizing said ester at a temperature of 0.degree. to 160.degree.C in the presence of at least 0.8% by weight of an alkaline reacting metal alcoholate of a monohydric alcohol having 1 to 12 carbon atoms and a strongly polar aprotic solvent, the weight ratio of the solvent to said ester being at least 0.5:1 and the weight ratio of the alcoholate being calculated as potassium methylate and based on said ester and a coating composition containing as an essential ingredient a binder obtained according to said process.

Abstract: A connector for electrically connecting sets of spaced electrical conductors is made by assembling, alternately in parallel relationship, sheets of electrically conductive material and sheets of electrically non-conductive material into a block structure, slicing from the block, in a plane perpendicular to the planes of the sheets, a plurality of slabs, each slab containing, alternately, elongated elements of electrically conductive material and elongated elements of electrically non-conductive material, assembling, alternately in parallel relationship, sheets of electrically non-conductive material and said slabs of elongated elements into a second block structure, and slitting from the second block, in a plane to which the elongated elements of electrically conductive material are essentially normal, a connector element.

Abstract: A process for the manufacture of a powdered coating material having a basis of hardenable synthetic resins, hardeners and pigments selected from the group consisting of metals, metal alloys, and mica for coatings with a metallic appearance wherein the single components are mixed in a finely divided state under an atmosphere of a protective gas and wherein the mixture is plasticized, under homogenization, at a temperature at which the viscosity of the synthetic resin is higher than the drop viscosity, but at most sufficiently high as to guarantee the flow, is homogenized by shearing stress and transformed into a powdered state, a powdered coating material prepared by said process and an article being coated with said coating material.