The invention relates to an apparatus enabling assessment in real time of the effectiveness of a treatment of a hydrocarbon well which is being applied by introducing fluids under pressure into an injection line. The apparatus comprises a computing unit provided with connections for connection to pressure and flow pickups mounted on the injection line at the surface, and connected to a data acquis...

Compounds of the formula wherein n is 0 or 1; A is methylene, vinylene or ethylene optionally substituted by lower alkyl; B is alkylene; R1 is an optionally substituted alkyl, phenyl or naphthyl group, or a cycloalkyl or pyridyl group; and R2 is hydrogen or acyl; and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as ...

The resistance to internal charring of molded styrene-butadiene latex foam rubber when exposed to a lit cigarette is improved by incorporating from about 10 to 30 parts by dry weight, per hundred parts by dry weight of latex of a compound selected from the group consisting of an organic phosphate of the formula wherein R is a C6-12 alkyl radical or a phenyl radical, which is unsubstitu...

Apparatus for supporting, locating and transferring plate-like or disc-shaped workpieces between several stations or between several machines where each of two plane parallel surfaces of each workpiece is subjected to one or more treatments has at least two partially overlapping plate chucks. A workpiece which is introduced by one chuck into the space where the two chucks overlap is released by th...

In producing an electret element having piezoelectric properties by subjecting a vinylidene cyanide copolymer to a polarization treatment, the copolymer is heat-treated at a temperature below the glass transition temperature thereof prior to or simultaneously with the polarization treatment to thereby increase the longitudinal piezoelectric effect (Kt).

Passivation of aluminum-metallized silicon components by applying at least one silicon layer. For the purpose of the subsequent contacting, the components are annealed after the application of the silicon layer at a temperature from 480 DEG to 570 DEG C. if the silicon layer thickness exceeds 0.1 mu m and a temperature from 400 DEG to 500 DEG C. if the silicon layer is up to about 0.1 mu m t...

1. Method for producing a graphic recording of a characteristic of the periphery of a borehole, comprising the step of producing, at different borehole depth levels, a plurality of measurement signals respectively representative of said characteristic for portions of the borehole periphery which are distributed around the borehole, characterized in that it further comprises the following steps : -...

A process for the preparation of styrene homopolymers or copolymers by suspension polymerization of monomers which contain dissolved styrene polymers from a preceding suspension polymerization, in the presence of sparingly soluble metal phosphates as suspension stabilizers, wherein, before the polymerization is started, the monomer phase is dispersed in an aqueous phase, containing a dissolved min...

This disclosure describes the treatment of cellulose acetate butyrate contact lenses which are rendered hydrophilic by contacting said lenses with a treating agent which increases the hydrophilicity of said lenses. The treating agent is ammoniacal salt, alkali-metal hydroxide, strong mineral acid, benzene sulfonic acid, alkali metal borohydride or organometallic compound.

In a method for preparing in partiuclar portrait photos by means of montage, a torso specimen is combined with a head specimen previously cut-out along its contour and fitted to scale, and this combination is photographed. In order to prepare in simple and rapid manner a large number of different yet high-quality montages, the torso specimen is photomechanically transferred to a transparent foil, ...

Process for removing Sr and heavy metals from water in particular from waste water by throughly mixing it with a solution of an alkali metal carbonate and/or hydrogen carbonate in a reactor containing a fluidized bed of suitable bed material. The obtained heavy metal carbonate crystals crystallize onto said bed material and the obtained heavy metal carbonate crystals in granular form are removed f...

The invention relates to an apparatus for atomizing a molten material, by disintegration of a stream of the molten material by fluid jets directed under high pressure against said stream, a first and a second fluid jet generated at opposite sides of the stream being converged towards a point of intersection lying aside of the stream of molten material, said first fluid jet being spread out in a pl...

Polymers comprising randomly repeating units of the general formula wherein R1 is linear or branched C1-C10 alkoxy, R2 is linear or branched C1-C10 alkyl, hydrogen or halogen, and W is C2 to C10 alkenyl-substituted aryloxy. These novel polymers are elastomers and may be used to form flexible and semirigid foams and coatings. They display good fire retardance and low smoke levels...

A cement retarder is provided which comprises 5 to 20% by weight, based on the weight of said retarder, of gluconic acid and/or tartaric acid and/or a water soluble salt thereof, 30 to 10% by weight, based on the weight of said retarder, of citric acid and/or an alkali salt thereof, and 50 to 85% by weight, based on the weight of said retarder, of an alkali carbonate. A rapid hardening cement is a...

Ultra-high molecular weight polyethylene powder is heated at a temperature between its crystalline melting point and about 275 DEG C. for a short period of time ranging from about one minute to about thirty minutes to obtain a molding powder having properties which facilitate the subsequent step of compression molding. Compression molded pieces made from heat-treated powder have better transparenc...

Two surfaces, one of which is of a molded article of a 4-methyl-1-pentene polymer and the other of which is of such a molded article or of an article of a vinyl alcohol type polymer or of metal or glass, are bonded together by applying to at least one of the surfaces a solution of a modified 4-methyl-1-pentene polymer in cyclohexene and/or carbon tetrachloride, and bringing the surfaces into conta...

A braking caliper for a pressure medium-operated spot-type disc brake is provided. The wheel cylinder piston for forcing the brake pads are held in a bore of a braking caliper which embraces the edge of the brake disc. The outer cylindrical surface of the pot-shaped wheel cylinder comprises a flange or collar which is in abutment with a shoulder provided between the two sections of the bore formed...

1. Moulding materials for the production of ageing-resistant films with improved workability, consisting of mixtures based on 1. polyvinyl chloride grafted with acrylate with a proportion of the acrylate in the graft polymer or mixed graft polymer of 30 - 60 % weight, preferably 35 - 50 % weight, (relative to 100 % weight of acrylate-grafted PVC or acrylate-grafted mixed vinyl chloride polymer) an...

A flat picture screen in which electrons from a gas discharge pass through selected holes (14) in a control plate (3) into a plasma-free space (6), are there subsequently accelerated to several kV and finally strike a phosphor layer (18) has the following construction: the rear part is a flexible metal foil (1) which at the same time acts as the gas-discharge cathode; the control plate (3) is spac...

In a device for the transmission of information from a borehole to the surface during the operation of a drilling device which comprises a rotary drill bit, a tubular housing and a pump which delivers a drilling fluid downwards through the tubular housing, through the rotary drill bit and upwards in the annular space between the tubular housing and the borehole, there is provided a detector arrang...