Abstract: Equalizer circuitry for a wideband signal recording/playback system, in particular a home video system, comprises a pre-emphasis and a de-emphasis circuit in the recording channel and the playback channel respectively. In an advantageous embodiment, the pre-emphasis and de-emphasis circuits are of the second-order type. In the preferred embodiment of the circuitry, in each of said channels there is provided a circuit for group-delay equalization, preferably an all-pass filter which comprises at least one substantially symmetrical transistor stage provided with a bridge circuit consisting of at least one reactive impedance and ohmic resistance and located between emitter and collector. Practical embodiments of the bridge circuit comprise several series-connected parallel LC sections and one ohmic resistance. Advantageously, conventional filter stages in the channels may be at least partially included in said circuit for group-delay equalization.

Abstract: An apparatus for the production of a jacket for a recording disk from a foldable blank, comprising a stationary receiving surface for one half of the blank and a further surface, pivotable essentially through an angle of 180.degree., for bending over the other half of the blank; a sheet-like spacer member which can be positioned over the stationary receiving surface, and one of whose edges, serving as a folding blade, is allocated to the swing point of the two said surfaces; and means for heating the fold area of the blank.

Abstract: 3,6-Dimethyl-3-hydroxy-oct-1-ynes and -oct-1-enes and their esters with lower alkanoic acids, of the general formula I ##STR1## where X and Y are H or the two X's and/or the two Y's together are a further bond between the carbon atoms on which they are present, and R is H, --CO--CH.sub.3, --CO--C.sub.2 H.sub.5 or --CO--C.sub.3 H.sub.7, their use as scents, and a process for the preparation of 3,6-dimethyl-3-hydroxy-octane. The novel compounds exhibit interesting, predominantly floral, woody, herbal and fruity notes. The alcohols of the formula I are of particular importance because they serve as intermediates for a novel and particularly advantageous method of obtaining 3,6-dimethyl-3-hydroxy-octane, a compound required in large amounts as a fragrance for soaps and detergents.

Abstract: A tape cartridge assembly and tape transport apparatus for use therewith, comprising a cartridge housing which is provided internally with holding means for a hub bearing a roll of magnetic tape, the roll of tape being accessible from outside, receiving means for the cartridge housing and the hub being provided on the apparatus, by which means the peripheral surface of the roll of magnetic tape can be brought into contact with a drive member.

Abstract: The method for improving cell structure with little or no shrinkage or foam collapse in molded high resilience open celled flexible polyurethane foams prepared by the reaction of an organic polyol having a hydroxyl functionality of at least 2 with an organic polyisocyanate in the presence of a blowing agent. This method comprises incorporating with the reactants three cell modifiers consisting of a polysiloxane-polyoxyalkylene copolymer, a polymethylsiloxane, and a polyether polyol cell modifier containing polyoxyethylene groups in amount of at least about 80 percent by weight of said polyether polyol.

Abstract: A process for dyeing polyester fibers which do not require a carrier with disperse dyes by the exhaustion method at 20.degree.-100.degree. C. and pH 4-6, with liquor ratios of from 5:1 to 100:1, and dyeing times of from 30 to 180 minutes, wherein the dyeing is carried out in the presence of from 0.5 to 20%, based on fiber weight, of a leveling agent consisting of an adduct of a C.sub.5 -C.sub.14 -alkylphenol or C.sub.5 -C.sub.14 -alkylnaphthol with from 4 to 25 moles of ethylene oxide.

Abstract: A magnetic head positioning servo arrangement for a system for recording or reproducing information on a flexible magnetic recording medium, the position of the head being adjustable, relative to the magnetic tracks of the recording medium, by means of an actuator, and each magnetic track being provided with at least one reference signal which, when sensed, provides information about the momentary position of the head and, in the case of mistracking, generates in a comparator circuit a control signal for the actuator which moves the magnetic head back over the center of the track, the reference signal consisting of at least one pair of pulse sequences which are recorded asymmetrically with respect to the center of the track and which, when sensed, produce increasing or decreasing signal pulses.

Abstract: A process for the preparation of electrically conductive hetero-polyphenylenes, having conductivities greater than 10.sup.-2 S/cm, wherein from 0.5 to 35 percent by weight of a strong Lewis acid having a pk.sub.a of from -10 to +4, preferably AsF.sub.5, SbF.sub.5, UF.sub.6, HClO.sub.4, NO.sup.+ SbF.sub.6.sup.-, NO.sub.2.sup.+ SbF.sub.6.sup.-, NO.sup.+ AsF.sub.6.sup.-, NO.sup.+ PF.sub.6.sup.-, NO.sub.2.sup.+ PF.sub.6.sup.-, NO.sup.+ BF.sub.4.sup.-, NO.sub.2.sup.+BF.sub.4.sup.-, NO.sup.+ ClO.sub.4.sup.-, (CF.sub.3).sub.2 SO.sub.4, 2,4,6-trinitrophenol, 2,4,6-trinitrophenylsulfonic acid or 2,4,6-trinitrobenzoic acid, is added to a hetero-polyphenylene in the absence of moisture and of oxygen.

Abstract: A process for the preparation of polyvinylpyrrolidone-iodine, wherein a polyvinylpyrrolidone which has been subjected to hydrogenation is reacted with iodine in a conventional manner. The novel process is particularly suitable for use with low molecular weight polyvinylpyrrolidone, having a K value of from 10 to 20.

Abstract: Flaky mica pigments coated with metal oxides are prepared by oxidizing vaporizable metal carbonyls to metal oxides with oxygen at an elevated temperature in the presence of mica flakes which are kept in motion. The amount of carbonyls introduced into the reaction zone does not exceed 5% by volume of the amount of other gases introduced.The coated mica pigments are employed as pigments in surface coatings, plastics and glasses.

Abstract: Products which have been obtained by reacting an acid of the formula I ##STR1## where R.sup.1 and R.sup.2 are hydrogen, fluorine, chlorine, bromine or alkyl or alkoxy of 1 to 4 carbon atoms, but the sum of the carbon atoms of R.sup.1 and R.sup.2 is not greater than 7 and preferably not greater than 3, A is a benzene, naphthalene or anthracene radical or a biphenyl structure, such as a diphenyl, diphenylmethane, diphenyl ether, diphenyl sulfide, diphenyl sulfoxide or diphenyl sulfone radical, R.sup.3 is hydrogen, alkyl of not more than 4 carbon atoms, .beta.-cyanoethyl or hydroxyalkyl of 2 to 4 carbon atoms, R.sup.4 is hydrogen, fluorine, chlorine, bromine, alkyl or alkoxy of 1 to 4 carbon atoms, hydroxyl or carboxyl and X is --SO.sub.2 -- or --CO--, with an amine of the formula II ##STR2## where R.sup.5 and R.sup.6 are hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.4 -hydroxyalkyl and/or ##STR3## R.sup.7 and R.sup.8 being hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.2 -C.sub.

Abstract: In addition to the very time-consuming enzymatic and hydrolytic desizing processes, oxidative degradation of starch size by means of persulfate, to render the starch water-soluble, is conventionally practised. Because of the chemical similarity between starch and cellulose, oxidative degradation of the cellulose is unavoidable in this desizing process. The invention overcomes this problem by breaking up the macromolecules of the starch into dispersible fragments by means of such small amounts of persulfate that neither is the starch made water-soluble nor is the cellulose significantly damaged, the dispersants employed for the fragments being relatively oxidation-stable polymers of unsaturated carboxylic acids.

Abstract: Halogenated tertiary alkyl isocyanates and a process for their preparation by reacting a tertiary alkyl isocyanate with halogen, sulfuryl chloride and/or sulfuryl bromide.The halogenated tertiary alkyl isocyanates prepared by the process of the invention are valuable starting materials for the preparation of pest control agents, fatliquoring agents, drugs, flameproofing agents, lubricating oils, synthetic resins and slip agents.

Abstract: A process for the preparation of electrically conductive hetero-polyaromatics, having conductivities greater than 10.sup.-2 S/cm, wherein from 0.5 to 35 percent by weight of a strong Lewis acid having a pk.sub.a of from -10 to +4, preferably AsF.sub.5, SbF.sub.5, UF.sub.6, HClO.sub.4, NO.sup.+ SbF.sub.6.sup.-, NO.sup.+ AsF.sub.6.sup.-, NO.sup.+ PF.sub.6.sup.-, NO.sub.2.sup.+PF.sub.6.sup.-, NO.sup.+BF.sub.4.sup.-, NO.sub.2.sup.+BF.sub.4.sup.-, NO.sup.+ ClO.sub.4.sup.-, (CF.sub.3).sub.2 SO.sub.4, 2,4,6-trinitrophenol, 2,4,6-trinitrophenylsulfonic acid or 2,4,6-trinitrobenzoic acid, is added to a hetero-polyaromatic in the absence of moisture and of oxygen.

Abstract: A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250.degree.-450.degree. C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275.degree.-425.degree. C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.

Abstract: 2-Hydroxyalkylchromans (I) ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each H or C.sub.1 -C.sub.8 -alkyl, R' is H or an organic radical which can be split off hydrolytically or hydrogenolytically as R'-OH or R'-COOH, and m is 1, 2 or 3, are prepared by reacting a hydroquinone II ##STR2## (a) with an alkenediol IIIa ##STR3## or (b) with an alkenediol IIIb ##STR4## or (c) with an alkenediol IIIc ##STR5## where R.sup.4' is a radical which during the condensation with II is converted to the radical R.sup.4,at from -50.degree. C. to 120.degree. C., in an inert solvent, in the presence of from 10 to 300 mole %, based on II, of a Lewis acid or of an adduct of a Lewis acid with a Lewis base which has a lower basicity than compound II.

Abstract: Novel carboxylic acid esters of the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are identical or different and each is hydrogen, halogen or alkyl or alkenyl of up to 5 carbon atoms,Y is 3-(2,2-dihalogenovinyl)-2,2-dimethyl-cyclopropyl or a radical of the formula ##STR2## where R.sup.4 is unbranched or branched alkyl, alkenyl or alkynyl of up to 4 carbon atoms or is an alicyclic radical of 3 to 7 carbon atoms,R.sup.5 is halogen, alkyl or alkoxy of up to 5 carbon atoms, trihalomethyl, cyano or nitro anda is from 0 to 3 andZ is a radical of the formula ##STR3## where X is oxygen, sulfur or --CH.sub.2 --,R.sup.6, R.sup.7 and R.sup.8 are halogen or alkyl, alkoxy or haloalkyl of up to 5 carbon atoms andb, c and d are from 0 to 3, their preparation and their use in insect and arachnid control.

Abstract: Dye intermediates of the formula ##STR1## where R.sup.1 is hydrogen, alkyl of 1 to 12 carbon atoms, phenyl which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, methoxy, ethoxy, chlorine or bromine, or phenylalkyl of 7 to 10 carbon atoms, R.sup.2 is hydrogen or R.sup.1 and R.sup.2 together are dimethylene, trimethylene or tetramethylene, which are unsubstituted or substituted by alkyl of 1 to 12 carbon atoms, R.sup.3 and R.sup.5 are hydrogen, alkyl of 1 to 12 carbon atoms, cyano-, chlorine-, methoxy- or ethoxy-substituted alkyl of 2 to 4 carbon atoms, cycloalkyl of 5 to 7 carbon atoms, phenylalkyl of 7 to 10 carbon atoms or trimethylene which is unsubstituted or substituted by 1 to 3 methyl and is bonded to the carbon atom in the 6-position or 6'-position of the benzene ring, R.sup.4 and R.sup.

Abstract: Disazo dyes of the general formula I ##STR1## where R is an araliphatic or aromatic radical, X.sup.1 is ##STR2## X.sup.2 is hydrogen, phenyl or an aliphatic or araliphatic radical, R.sup.1 is hydrogen or an aliphatic, cycloaliphatic, araliphatic or aromatic radical, the rings A, B and C may be substituted and the rings B and C may carry a fused benzo ring, and the group ##STR3## may also be a heterocyclic radical of the formula ##STR4## The novel dyes are very suitable for dyeing polyesters and cellulose.

Abstract: A gel dentifrice containing a cogeneric mixture of conjugated polyoxybutylene-polyoxyethylene block copolymers retards plaque formation and growth, and remains a gel below about 20.degree. C.