Abstract: There is described a process for the production of a compound of formula I, ##STR1## in which at least one each of R.sub.1, R.sub.2 and R.sub.3, and of R.sub.4, R.sub.5 and R.sub.6, represents an electron withdrawing group, or one of R.sub.1, R.sub.2 and R.sub.3 together with one of R.sub.4, R.sub.5 and R.sub.6 form a --CO-- group, and the remainder of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which may be the same or different, each represent an electron withdrawing group, alkyl, cycloalkyl, phenyl or phenylalkyl,or R.sub.1 and R.sub.2, or R.sub.4 and R.sub.5 , and R.sub.1 and R.sub.4, may together form a --(CH.sub.2).sub.n --chain, in which n is a whole number up to 5,the alkyl, cycloalkyl, phenyl or phenylalkyl group or the --(CH.sub.2).sub.n --chain optionally being substituted, which comprises reacting a compound of formula II, ##STR2## in which R.sub.1 a, R.sub.2 a and R.sub.3 a have the same significances as R.sub.1, R.sub.2, and R.sub.

Abstract: Self-clearing anchor (10) having one or more arms (13) hinged to the stem (11), in the vicinity of the crown (12) of the anchor (10), cooperating with biassing member (17) to counteract the rotation of the arms (13), the arms being adapted, when subjected to a determined stress, to collapse beyond the crown (112) of the anchor (10). In the anchor, the biassing member (17) can be adjusted by appropriate regulation member (19).

Abstract: A process for making substrates for interconnecting components in which a filament is applied and affixed to a base in a pre-programmed pattern, the base surface and applied filaments are coated with a coating and the coating is hardened to form a substantially flat surface over the base and filaments. The coated base is then positioned on a table movable along "x" and "y" axes and the coated base is positioned under a high energy beam at pre-programmed points on the applied filament pattern and access openings are formed in the coating on the base at such points to expose the filament at each such point so that the exposed filament can be interfaced with the exposed surface of the coated base and articles for mounting and interconnecting components formed thereby.

Abstract: An electrochemical process is disclosed for the synthesis of organic compounds, said process having the unique characteristic that the element evolved at the anode is exploited by having it reacting with the product of electrolysis obtained at the cathode by the presence of an appropriate catalyst. The catalyst may be associated in the most convenient manner to the anode, or it can be the anode itself. The process opens the way to a number of synthesis reaction which may be carried out electrolytically instead of the conventional ways.

Abstract: A variable frequency AC induction motor servo control system wherein slip is generated as a function of stator current. In a preferred embodiment the slip per ampere ratio is constant in the range from zero to approximately base speed and thereafter increases exponentially as the rotor speed increases above base speed.

Abstract: A storage stable diagnostic reagent for colorimetric determination of urea nitrogen, the reagent having enhanced sensitivity, and comprises a chromogenic agent, a color enhancer, and a cyothioamine, as well as method employing said reagent.

Abstract: A method of winding brushless motors is disclosed. According to the method one turn of the winding is applied to each phase of a multi-phase motor, then, a second turn is applied to each of the phases, etc., until the required number of turns are wound. The method results in a layered winding having a minimum of end turned build-up and excellent inductance balance between phases of the winding. Because the winding for each phase is continuous, a high reliability winding is produced.

Abstract: The invention relates to a process for recovering from potassium mineral flotation tailings sodium chloride of sufficiently high purity to make it suitable for industrial use, characterized by comprising the following stages:(a) washing said flotation tailings with water and with the mother liquor from one or more successive stages of the process, said mother liquor containing sodium chloride as undissolved bottoms, to give a mixture of a solid phase comprising nearly all the sodium chloride contained in said fed tailings, and a liquid phase(b) separating said mixture into a first turbid portion enriched in said solid phase, and a second turbid portion enriched in said liquid phase(c) separating the solid phase from the liquid phase of said first turbid portion, this latter separated phase constituting at least part of said mother liquor for use in stage (a), and possibly(d) drying the solid phase separated in stage (c) to produce high purity sodium chloride.

Abstract: A process for making substrates for interconnecting components in which a filament is applied and affixed to a base in a pre-programmed pattern, the base surface and applied filaments are coated with a coating and the coating is hardened to form a substantially flat surface over the base and filaments. The coated base is then positioned on a table movable along "x" and "y" axes and the coated base is positioned under a high energy beam at pre-programmed points on the applied filament pattern and access openings are formed in the coating on the base at such points to expose the filament at each such point so that the exposed filament can be interfaced with the exposed surface of the coated base and articles for mounting and interconnecting components formed thereby.

Abstract: The invention includes the steps of, and suitable apparatus for, maintaining a plurality of relatively dense bead-like particles of inert solid material dispersed throughout the fluidized combustion bed, for circulation through heat exchange means separated from the combustion bed and return to the fluidized bed along with other bed constituents. Fine limestone particles may also be introduced into the combustion bed along with fresh fuel particles. The circulating bed constituents are discharged from an arched heat exchange outlet to direct the returning bed constituents in a generally horizontal direction directly over the combustion bed for generating increased circulation in the bed. In addition, the inlet for introduction of fresh fuel and fine limestone is located just below the arched discharge channel to enhance horizontal discharge velocity.

Abstract: This invention relates to a process for carrying out continuous demonomerization and postpolymerization of Polyamide 6 melts and a reactor for carrying out this process. The reactor of this invention has a cylinder with a horizontal axis around which an interior rotor shaped like a cage rotates. The reactor can be partially filled with polymer melt. There is a multitude of elements along the periphery of the rotor which partly dip into the melt and serve to convey the melt through the reactor, generate new surfaces and mix and homogenize the melt as the polymer melt undergoes demonomerization and postpolymerization under vacuum.

Abstract: A device for backfilling a trench from spoil left alongside it comprises a forecarriage (7) and a main frame (10). The former comprises means (12) for positioning it centrally in the trench (3). The latter is located behind the former and carries one or more angled blades (9) and lateral stabilizers (18,19) adapted to contact the ground outside the spoil.The device is towed rather than pushed and if a long tow-rope is used a pipeline can be trenched and the trench backfilled in a single traverse.

Abstract: In order to produce a heat-sensitive record material having high speed recordability without fogging a heat-sensitive record material having a heat-sensitive record layer coated thereon is passed through a nip between a metal roll and an elastic roll of 42.degree. to 69.degree. Shore-D hardness defined by ASTM Standard, D-2240 at a nip pressure enough to obtain a Bekk smoothness of 150 seconds or above on the record layer surface.

Abstract: A heald control system for a multi-phase or travelling wave shedding loom in which each heald is upperly connected elastically, by way of an elastic traction element, to a single support plate which is removably locked to the fixed part of the loom, and the healds of each section are lowerly locked to a single connection block which is connected by a spring catch connector to a flexible element, which is itself connected to the end of a cam-controlled operating lever.

Abstract: A machine tool for working sheet metal is described. The principal characteristic of the present invention lies in the fact that it comprises electronic apparatus operable to control the adjustment of the stroke of a striker which can strike a pin supporting a tool for punching or nibbling a metal sheet.

Abstract: An optical scanner for orthogonal scanning in read and/or write modes has a framing mirror (20) for linear vertical scanning and a rotating disc (30) with a circular array of concave reflectors (32) for horizontal scanning. Primary imagers (24, 164) focus the linear vertical scan onto a strip mirror (26) which reflects the scanned pixels to the concave reflectors. Preferably, the concave reflectors reflect the pixel image in a collimated beam which is focused by a collection optic (38, 200) onto radiation detector (40). Image rotator (221), collection aperture defining device (270, 272), aperture shading device (290), and a device for suppressing spurious radiation are also provided.

Abstract: A brushless DC tachometer including an alternator which produces a substantially trapezoidal output signal coupled to an FET transistor switching bridge. The trapezoidal output signal is achieved using a block permanent magnet for one pole and a consequent pole contoured to achieve a substantially uniform flux density for the winding over a distance sufficient to produce a trapezoidal output signal.

Abstract: In a multiple talk path key telephone of the type of having multiple handsets, each handset is coupled to the key field for a predetermined short period of time when it is initially taken "off hook". During this predetermined time period a user can depress a key and connect with a desired telephone line. If the user has the handset "off hook" and desires to connect to another telephone line, he merely depresses an access key and the handset is again reconnected to the key field for the predetermined time period. The present invention eliminates the possibility of one user disconnecting another user's telephone line during a telephone conversation.

Abstract: A process for preparing 2,2,6,6-tetramethyl-4-piperidone from ammonia and acetone, wherein acetone and ammonia are reacted in a single stage for a time of 2 to 8 hours in an acetone:ammonia molar ratio of 20:1 to 4:1, at a temperature of 50.degree. to 120.degree. C. and at a pressure of 1 to 50 atmospheres, in the presence of 0.001-0.1 moles of acid catalysts per mole of acetone used in the reaction.

Abstract: A method of inhibiting corrosion of a metal surface comprises applying to the metal surface an organic solvent in which is dissolved a phosphate monoester of a hydroxyalkyl acrylate or a hydroxyalkyl alkylacrylate which phosphate monoester has the general formula; ##STR1## where R.sub.1 is hydrogen, a methyl group or an ethyl group R.sub.2 is an alkyl group having from 2 to 10 carbon atoms andn is a positive integer from 1 to 20The solution may also contain a diester of a hydroxyalkyl acrylate, a diester of a hydroxyalkyl alkylacrylate, hydroxyalkyl acrylate or hydroxyalkyl alkylacrylate.The method may also improve the adhesive strength of a subsequently applied protective coating e.g. paint.