Abstract: A method of reducing the NO.sub.x --emissions during combustion of nitrogen-containing fuels via burner units each including a primary burner and being arranged in a wall of a closed combustion chamber; fuel and air for combustion are supplied to the burner flame in stages as partial flows via delivery means which are separate from one another.

Abstract: A hearing aid of the type which is worn behind the ear has a battery compartment and a volume control knob at its lower end. The compartment and knob are at right angles to the longitudinal axis of the device.

Abstract: As opposed to standard circuit board fabrication techniques, whereby plated holes are commonly bored through all the layers of a multilayer board, the circuit board for a hearing aid according to the invention is fabricated by alternatingly forming plated holes in subpackets of the circuit board and then joining together the subpackets until the completed multilayer board is bonded together. The circuit board can be provided with plated internal holes, plated blind holes as well as standard through holes. An especially high component density on the two surfaces of the circuit board is acheived, as well as the fabrication of extremely thin and flexible multilayer circuit boards.

Abstract: A miniature hearing aid comprises an input transducer (18), amplifier (19) and control elements (8, 10) as well as a current source and output transducer (20), where at least a part of the amplifier (19) is applied on mounting surfaces hinged together and lying on mounting plates (46 to 49) and the articulated connections (60 to 63) have a flexible support provided with electrically conducting tracks (50 to 52, 57). The desideratum is, in view of the small space in miniature hearing aids, to obtain a large area for the application of the structural components or elements. This is achieved according to the invention in that the amplifier (19) is designed as a multi-layered system which comprises at least three layers (40 to 42), of which the two outer ones (42, 43) carry the physical or structural elements (53, 54, 54.

Abstract: A process for the isolation of a dihydroxybenzenemonoether from a reaction mixture containing solvent, ether and unreacted dihydroxybenzene, comprising contacting the reaction mixture with at least one hydrocarbon which is not miscible or only partially miscible with the reaction mixture, the ether selectively entering the hydrocarbon. Advantageously the reaction for the preparation of the monoether is carried out in an alcohol, a ketone, a dipolar aprotic solvent or a polyhydroxyalkyl ether, or a mixture thereof with water, the hydrocarbon used as extracting agent has a boiling point between about 80.degree. and 300.degree. C., and the extraction is carried out in the presence of water whereby there is an increase in the selectivity of the extraction.

Abstract: A burner for combustion of nitrogen-containing fuels. The burner includes a core-air tube with centrally arranged oil atomizing lance, a dust tube surrounding the core-air tube, a mantle-air tube which surrounds the dust tube and is provided with an axially shiftable twist-blade ring arranged at the air inlet, as well as a burner opening which expands conically toward the combustion chamber. The core-air tube and the mantle-air tube are supplied from a main air conduit. Air jets or nozzles are provided in a concentric arrangement around the burner opening. These air nozzles are connected with the main air passage by conduits, and the air stream discharging from the air nozzles is regulated by a flap.

Abstract: A process for the isolation of a dihydroxybenzene-monoether from a reaction mixture containing solvent, ether and unreacted dihydroxybenzene, comprising contacting the reaction mixture with at least one hydrocarbon which is not miscible or only partially miscible with the reaction mixture, the ether selectively entering the hydrocarbon. Advantageously the reaction for the preparation of the monoether is carried out in an alcohol, a ketone, a dipolar aprotic solvent or a polyhydroxyalkyl ether, or a mixture thereof with water, the hydrocarbon used as extracting agent has a boiling point between about 80.degree. and 300.degree. C., and the extraction is carried out in the presence of water whereby there is an increase in the selectivity of the extraction.

Abstract: A process for the preparation of a monoalkyl ether of a hydroxyphenol of the formula ##STR1## in which Z each independently is hydrogen or a substituent which is stable under the reaction conditions,R is lower alkyl, andn is 1, 2, 3 or 4,comprising reacting a hydroxyphenol of the formula ##STR2## with an alkyl halide, alkyl sulphonate or aryl sulphonate alkylating agent of the formulaR--Xin which X is a halogen atom, or an alkylsulphonyloxy or arylsulphonyloxy radical,at a temperature from about 130.degree. C. to 200.degree. C. and in the presence of an alkali metal base or alkaline earth metal base and of a diluent comprising a polyhydroxyalkyl ether having at least one OH group. Advantageously the base is sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate, the hydroxyphenol is pyrocatechol, the alkylating agent is isopropyl chloride, isopropyl C.sub.

Abstract: In the preparation of a 7-hydroxycoumaran of the formula ##STR1## in which Z is a hydrogen atom or a substituent which is inert under the subsequent reaction conditions,R.sup.1 is a hydrogen atom or a C.sub.1 to C.sub.4 -alkyl radical, andn is 1, 2 or 3wherein a pyrocatechol of the formula ##STR2## is reacted with an allyl compound of the formula ##STR3## in which Y is a halogen atom, a C.sub.1 to C.sub.4 -alkyl-sulphonate radical or an aryl-sulphonate radical,to form the mono-ether of the pyrocatechol in a first stage, and in a second stage, of the pyrocatechol monoether formed in the first stage is rearranged to a 3-alkenylpyrocatechol, and in a third stage the 3-alkenylpyrocatechol formed in the second stage, is cyclized, the improvement which comprises stages. (b) carrying out the second stage at a pH of about 2-8.

Abstract: Monoazo dyestuffs of the formula ##STR1## wherein R.sub.1 represents an aromatic radical, an aliphatic radical with 1-4 C atoms or a dialkylamino radical, in which the alkyl groups contain 1-C atoms, R.sub.2 represents hydrogen, halogen, alkyl with 1-C atoms, alkoxy with 1-4 C atoms or trifluoromethyl, R.sub.3 represents hydrogen, halogen, alkyl with 1-4 C atoms, alkoxy with 1-4 C atoms or trifluoromethyl and K represents the radical of a coupling component K-H of the formulae (II), (III) and (IV) ##STR2## wherein R.sub.4 represents alkyl with 1-4 C atoms or aryl,R.sub.5 represents hydrogen or unsubstituted alkyl with 1-4 C atoms,R.sub.6 represents hydrogen, nitrile, halogen, alkyl with 1-4 C atoms or alkoxy with 1-4 C atoms,R.sub.7 represents hydrogen, alkyl with 1-4 C atoms, aryl, a carboxylic acid ester group or a carboxylic acid amide group,R.sub.8 represents hydrogen, alkyl, cycloalkyl, aryl or the radical of a heterocyclic compound,R.sub.

Abstract: Monoazo dyestuffs of the formula ##STR1## wherein K represents the radical of a couping component K-H of the formula ##STR2## said dyestuff being suitable for the dyeing of synthetic fibre materials especially those from polyamides.

Abstract: A process for the preparation of a trichloromethyl-trifluoromethyl-benzene of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent hydrogen, fluorine or chlorine,By contacting at least one molecule of the formula ##STR2## wherein R.sup.1 and R.sup.2 are as previously identified, m and n are independently 0 to 3With another molecule of the formula ##STR3## wherein M AND N ARE INDEPENDENTLY 0 TO 3In the presence of a halogen transfer catalyst, optionally in the presence of a promoter.

Abstract: A process for preparing a xylene which is fluorinated and chlorinated in the side chain, having the formula ##STR1## wherein X represents hydrogen or fluorine andY represents hydrogen or chlorine andR.sup.1 and R.sup.2 are identical or different and represent hydrogen, halogen, a trifluoromethyl or trichloromethyl group or an aliphatic or aromatic radical andR.sup.1 and R.sup.2 can be bonded via hydrocarbon members to form an aromatic ring,By contacting a compound of the formula ##STR2## wherein X, R.sup.1 and R.sup.2 have the above-mentioned meanings, WITH A COMPOUND OF THE FORMULA ##STR3## wherein X, R.sup.1 and R.sup.2 have the above-mentioned meanings, in the presence of a halogen transfer catalyst at elevated temperature.

Abstract: The invention relates to the transfer printing hydrophobic fibre materials using paper supports which are printed with azo dyestuffs of the formula ##STR1## wherein X.sub.1 and X.sub.2 represent hydrogen or alkyl or cycloalkyl radicals andn represents 1-3, and wherein the benzene ring A can contain non-ionic substituents and the benzene ring B can contain customary non-polar substituents.

Abstract: Bis-halogen carbonyl anilines useful in the production of herbicides having the formula ##SPC1##WhereinX is fluorine or chlorine,Y is fluorine, chlorine, fluorocarbonyl, or chlorocarbonyl,Z is halogen, nitro, cyano, lower alkyl sulfonyl or carbalkoxy,R is lower alkyl, alkoxy, thioalkyl, phenyl, naphthyl, lower perhalogen alkyl, perhalogen alkoxy or perhalogen alkylthio,a and b represent a number from 0 to 5, with the proviso that a plus b is at the most 5,Are prepared by reacting an aryl carbamic acid fluoride having the formula ##SPC2##WhereinZ, r, a, b are as defined above with an acylating agent having the formula ##EQU1## wherein X and Y are as defined above in the presence of a tertiary amine at a temperature in the range of from -20.degree. to +40.degree.C.

Abstract: 2-Trifluoromethylimino-benzo-heterocyclic compounds of the general formula ##SPC1##In whichX is oxygen or sulfur,Y is oxygen, sulfur or the radical ##EQU1## R is lower alkyl, cycloalkyl, aryl, aryl substituted by at least one of halogen, nitro, methyl and methoxy, alkylcarbalkoxy with up to 6 carbon atoms, alkylsulfonyl, arylsulfonyl, dialkylamidosulfonyl, or --CO--R',R' is alkyl or alkoxy with up to 12 carbon atoms, aryl, amino, lower alkylamino, di-lower alkylamino, or arylamino, each Z independently is halogen, trifluoromethyl, nitro, lower alkyl, lower alkoxy, di-lower alkylamino, acyl with up to 6 carbon atoms, a sulfonic acid group, a sulfonic acid amide group, or a sulfonic acid amide group substituted by alkyl with up to 6 carbon atoms, andm is an integer from 0 to 4,Which possess fungicidal, insecticidal and acaricidal properties, and a process for their preparation wherein a compound of the general formula ##SPC2##Is reacted with perfluoroazapropene of the formulaF.sub.2 C=N-CF.sub.

Abstract: 2-Trifluoromethylimino-1,3-dithiolo[4,5-b]-quinoxalines of the formula ##SPC1##In whichX is lower alkyl, lower alkoxy, trihalogeno-methyl, trihalogenomethoxy, halogen or nitro, andn is an integer from 0 to 4,Which possess insecticidal, acaricidal, fungicidal and nematocidal properties.