Abstract: An aromatic heterocyclic compound has the formula ##STR1## wherein R.sub.1 represents (i) --CH.sub.3, (ii) --CH.sub.2 OH or (iii) ##STR2## wherein R.sub.3 represents hydrogen, --OR.sub.4 wherein R.sub.4 represents hydrogen, alkyl having 1-20 carbon atoms, mono- or polyhydroxyalkyl or R.sub.3 represents ##STR3## wherein r'and r" represent hydrogen or lower alkyl, R.sub.2 represents hydrogen or --CH.sub.3 and Ar represents ##STR4## wherein Z is O or S, ##STR5## wherein R.sub.5 is lower alkyl or ##STR6## wherein R.sub.6 is hydrogen or alkyl having 1-10 carbon atoms and R.sub.7 represents alkyl having 4-12 carbon atoms or cycloalkyl, Y is CH and X represents oxygen or sulfur, with the proviso that (i) when Y is CH and X is oxygen or sulfur Ar is other than C wherein R.sub.5 is CH.sub.3 and (ii) when Y is CH and X represents sulfur Ar is other than A.The compound is useful in the treatment of dermatologic ailments linked to a keratinization disorder.

Abstract: A composite abrasive product comprises a refractory carbide support and a ring-shaped compact having a rotational symmetry about an axis of the support. The compact has an axial thickness which is small as compared with the axial thickness of the support and a substantially triangular axial cross-section, said compact having a face metallurgically bonded to a chamfered circumferential part of the support and the two remaining faces joining at a cutting edge. A method for manufacturing such a product is also disclosed.

Abstract: Phenol/substituted phenols are prepared by directly hydroxylating an aromatic substrate with nitrous oxide, in vapor phase, in the presence of a modified (acidified) ZSM-5 or ZSM-11 zeolite, containing such elements as Ga, Fe, B, In, Cr, Sc, Co, Ni, Be, Zn, Cu, Sb, As or V.

Abstract: The dispenser comprises a body forming a magazine for objects to be dispensed and terminated by a tubular neck defining a dispensing chamber suitable for receiving a determined number of objects to be dispensed on a first occasion, the number being equal to or greater than one, and a tubular head capable of sliding over the outside of the neck. When the head is pushed onto the neck by pressing the free end of the head down onto a reception surface, the free end of the neck resiliently deforms a shutter diaphragm so as to allow the objects to be dispensed to fall out onto the reception surface, while resilient tongues cut out in the wall of the neck serve to retain the next object. After pressure has been released, the resilience of the diaphragm gives rise to a reverse movement with the tongues releasing the objects to be dispensed during the following movement while the diaphragm closes in order to hold the objects in the dispensing chamber.

Abstract: A safety ski binding for holding a ski boot on a ski compensates for biases of violent but brief intensities. A shock absorber is located within a compression spring which presses against an adjustment nut. A rocking device transfers the movement of the shock absorber during a violent bias to the adjustment nut to cause additional compression of the spring. At least one hole is in the piston of the shock absorber to permit the passage of fluid during biases of weak intensities and to prevent the passage of the fluid during biases of violent but brief intensities.

Abstract: A device and method for detecting and quantifying a substance by filtration. The device includes a body having two parts (1 and 2) nested into each other. One of the parts (1) is used as a reservoir and the other part (2) is used as a filter-holder and as a receptacle. The device further includes a retention and reaction system including a strut (3), two multi-pierced or perforated plates (4 and 5) which encase a filtering member and a thin strut. A seal is further provided between the two parts. The reservoir and the receptacle are connected to an external circuit by means of conduits, mouthpieces and pipes. The interlocking of the two parts is achieved by means of jointed hooks.

Abstract: A resilient support is provided comprising an elastomer matrix symmetrical with respect to a given axis, a plurality of composite material cables embedded in this elastomer matrix and a plurality of fixing devices allowing the cables to be subjected to flexional forces in any one of three directions of a spatial axis reference system. In a preferred embodiment, the resilient support comprises a cross shaped matrix in the arms of which the cables are embedded and which comprises fixing devices formed by composite blade springs situated in the extension of each arm of the cross.

Abstract: Methods for improving the anti-friction and wear-reducing properties of lubricating oils by adding to such oils polyfluoro chain-containing amines of the formula ##STR1## or the commercially available mixtures of such materials, wherein n is an integer from 1 to 20, a is two or four, R.sub.2 is hydrogen or a lower alkyl group, and R.sub.1 and Z are:When Z is hydrogen, R.sub.1 is hydrogen or an alkyl group having from one to six carbon atoms, an aryl radical, or an alicyclic radical having from three to ten carbon atoms, orR.sub.1 and Z are selected from alkyl radicals having from one to six carbon atoms, orZ is ##STR2## while R.sub.1 is hydrogen, an alkyl group having from one to six carbon atoms, or ##STR3## R and R' being hydrogen or methyl, or R.sub.1 and Z together form a linear alkylene group containing from three to ten carbon atoms,and lubricating oils containing such polyfluoro chain-containing amines and "ash-free" or organometallic dispersant/detergent additives.

Abstract: The lens is formed by the association of two electromagnetic lenses sharing one and the same magnetic circuit crossed by one and the same central channel. The first lens is a shielded lens and has an annular gap at one of its ends. This annular gap cuts the central channel along a direction the plane of which is perpendicular to the optical axis. The second lens is a single-pole lens surrounding the annular gap of the first lens. It has an annular gap demarcated by two lips, the walls of which have shapes generated by revolution around the optical axis. Induction coils enable the magnetic flux of the gaps to be made to vary.

Abstract: The present invention relates to .alpha.,.beta.-dimethylhistamine, of the rmula: ##STR1## in racemic form, or an optical isomer form or mixture of diastereoisomers and its acid addition salts. It may be prepared from an alkyl 2-amino 3-(1H-imidazol-4-yl)-carboxylate.

Abstract: The invention relates to compounds of general formula: ##STR1## in which A, B, G, D which may be identical or different, each denote a hydrogen atom or a halogen atom, a lower alkoxy group or alternatively a lower alkyl group optionally substituted with one or more halogen atoms,X denotes a hydrogen atom, a linear or branched lower alkyl group or a group SO.sub.2 E in which E denotes a linear or branched lower alkyl group or an aryl group optionally substituted with a linear or branched lower alkyl group,T denotes a hydrogen atom or a lower alkyl group,R.sub.3 denotes a hydrogen atom or a linear or branched lower alkyl group or an aryl group optionally substituted with one or more linear or branched lower alkyl groups,n and m, which may be identical or different, each denote 0 or 1,R.sub.1 and R.sub.2, which may be identical or different, each denote a hydrogen atom or a linear or branched lower alkyl group,or alternatively,R.sup.1 and R.sup.

Abstract: A system for reading and encoding a magnetic track (2) carried by a supporting document (1) which is displaced manually past read and write members, the magnetic track comprising a first portion (3) on which a fixed first encoded message characteristic of the supporting document is recorded, said message being encoded by means of an encoding system which conveys its own clock signal, the first portion of the track being followed by a second portion (6) in which a variable second encoded message is written each time the supporting document goes past said read and write members, wherein the read and write members comprise three magnetic heads in alignment, comprising a first head (9) which is a read head, a second head (10) which is a write head, and a third head (11) which is a read head, the write head (10) being connected to a write signal generator (12) having a first input (13) which receives data representative of said variable message to be recorded on said second portion of the magnetic track, and a sec

Abstract: A filter having a dielectric resonator, the filter comprising at least one cylindrical cavity (10) inside which there is a dielectric resonator (11) whose axis of symmetry (.DELTA.) is colinear with the axis of symmetry of the cavity (10), the filter being characterized in that the resonator is held by a system of dished washers (15, 16). Applicable to microwave frequencies.

Abstract: A system for transmitting optical information uses several transmitters and receivers connected by optical fibers. The transmitters and receivers are arranged in individual networks in each of which all the optical fibers leaving the transmitters are coupled to one another and all the optical fibers arriving at the receivers are coupled to one another. In addition, all the optical fibers leaving the transmitters in each individual network are interconnected to the corresponding optical fibers, i.e., those leaving the transmitters, in all the other networks.

Abstract: The present invention concerns a transformer of the ferrite closed magnetic circuit type, with a gap.The gap is filled with a mastic such as the polysulphide or polyurethane mastics having a Shore hardness with constant behaviour as a function of temperature.

Abstract: The filter disclosed has a feedback circuit to stabilize the matching frequency f.sub.o at any instant, in acting on the bias current and voltage of the variable capacitance diodes of the filter, when interfering signals have a frequency located in the pass-band of this filter.

Abstract: Shaped articles of agglomerated particulate material are prepared by conveying plates having apertures therethrough on a surface for forming, by reason of the plate apertures and the forming surface, article shaping cells. Particulate material to be formed into the shaped articles is fed into the cells, and then while the plates remain on the forming surface, the particulate material in the cells first is tamped, and then while the plates ascend from the forming surface, the tamped material is ejected from the cells onto the forming surface in a form of shaped articles.

Abstract: A method of manufacturing a unit assembly of filter membranes obtained by precipitating a polymer solution, comprises the following steps: a plurality of elongate porous elements are placed in an outer shell having a closed end and an open end, the elongate elements passing through said closed end and having longitudinal axes which are parallel to one another and to the direction extending between the two ends; injecting the polymer solution around the porous elements; injecting a fluid into one end of the elements, the fluid diffusing through the elements towards the polymer; and removing the polymer solvent which diffuses in the opposite direction from the other ends of the elements, thereby causing the polymer to precipitate and form a porous polymer structure around the porous elements and between them, with the porous structure having in contact with the porous elements a skin of adjustable porosity then removing the porous elements in order to unmold a porous polymer block pierced by channels whose long

Abstract: Ceramic superconductor materials, e.g., of rare earth/alkaline earth metal/transition metal/oxygen type, contain an effective stabilizing amount of fluorine atoms distributed therein in a concentration gradient decreasing from the external face surface of the material to the core region thereof; advantageously the fluorine atoms are principally distributed in an external protective diffusion barrier layer.

Abstract: Phenols/phenol ethers are hydroxylated by reaction with hydrogen peroxide in the presence of a catalytically effective amount of a calcined germanozeosilite MFI zeolite.