A microprocessor-based burner control apparatus includes an input stage adapted for controllably generating an input signal which is repetitively transitional between a first logic state and a second logic state. A synchronously controlled output stage includes a capacitor, a rectified source of alternating voltage and a microprocessor-switched transistor for controllably charging the capacitor du...

1. A process for the production of flame-retardant foams containing polyurethane and/or polyisocyanurate groups, by reacting organic polyisocyanate with polyols in the presence of flame retardants, catalysts and blowing agents and, if desired, chain extenders, crosslinking agents, auxiliaries and additives, wherein a synergistic system consisting of (a) organic compounds containing halogen or halo...

A tyre (10) produced by way of a moulding or casting process in a manner such that each of its bead areas (16) includes an annular slot (42) whereby the slots permit the insertion of an inextensible annular reinforcement element (40) into each of the bead area slots (42) after the moulding or casting process. Slots (42) are preferably produced by the addition of annular collars (64) to either the ...

PURPOSE:To obtain a superconductive wire which has no a. c. loss and is stable.

In a processing plant in which workpieces are conveyed to selected work stations according to a programme, the computer programme chosen for the plant operation and representing a simulated operating schedule is run through during the actual operation of the plant in synchrony with the latter. The plant comprises a number of sensors by means of which data on actual events taking place in the plant...

The present invention relates to a process for treating polyvinylidene fluoride surfaces to enhance adhesion of other polymers thereto comprising applying to at least one surface thereof a solution consisting essentially of a coating polymer selected from a polyurethane or an alkyl polymethacrylate and at least one aprotic polar solvent in which said polymer is soluble, and exposing said surface t...

A drive for high-speed locomotives has a variable-speed electric motor which transmits torque to the input shaft of a hydrodynamic power transmission having a hydrodynamic torque converter and a hydrodynamic coupling for transmission of torque to the output shaft which drives the wheels through the medium of a mechanical transmission and cardan shafts. The control unit of the drive engages the con...

1536233 Lined steel pipe PRODUITS CHIMIQUES UGINE KUHLMANN 29 April 1977 [12 May 1976] 18092/77 Heading F2P [Also in Division B5] In a method of lining a steel tube with a polyvinylidene - fluoride lining, the surface of the lining to face the tube is coated with a film-forming polyurethane solution and the internal surface of the tube with a silane, the lining is placed within the tube and the sp...

Method of preparing pulverulent polymer or copolymer compositions based on vinyl chloride and suitable for immediate use comprising preparing a master mixture of said polymers and/or copolymers based on vinyl chloride and additives employed therewith in use by mixing in an aqueous medium one or more of said polymers and/or copolymers and said additives in the form of liquid additives and/or fusibl...

A composition for producing rigid, self-supporting, expanded materials comprises from 30 to 40% by weight of an orthophthalic polyester resin, from 19 to 28% by weight of an isocyanate, from 24.3 to 34.7% by weight of an inert silicate having a specific gravity of from 0.3 to 0.7, from 0.7 to 1.3% by weight of a catalyst and an accelerator, from 4.8 to 10% by weight of a flame retardant, ...

In a continuously variable transmission apparatus for a vehicle having a slip type clutch disposed between a drive shaft of an engine and an input shaft of a continuously variable transmission mechanism, a torque detecting device to detect torque of the engine, an engine speed detecting device to detect rotational speed of the engine, an output shaft speed detecting device to detect rotational spe...

A power supply arrangement (Fig. 2) for a well drilling installation enables hydraulic energy to be made available downhole for use in, for example, generating MWD pulses or operating hydraulic devices or for conversion to electrical energy. A piston (31) is exposed to the pressure difference between the interior of the drill string (1) and the return annulus (13) and compresses a resilient member...

A system for surveying a borehole or mine shaft to determine its trajectory uses a sensing probe with two spaced sets of accelerometers in sections 22, 23 measuring the components of the gravity vector along orthogonal axes at successive positions along the borehole 20. The two sets of accelerometers are connected by a pipe or cable 24 which is flexible to bend but torsionally stiff. The angular o...

A packaging film comprises a base film of at least partially water-soluble plastics film, for example, polyvinyl alcohol, carrying on one side a protective layer of particulate inert plastics material, for example, polytetrafluoroethylene powder, having a high water repellency. The film is thus vulnerable to attack by aqueous media on one side and protected against such attack on the other. It may...

An aluminium base alloy having a composition selected from:- (i) Cr 1.5% to 7.0% by weight Zr 0.5% to 2.5% by weight Mn 0.25% to 4.0% by weight Al remainder including normal impurities, and (ii) 7000 series Al alloys containing as added constituents:- Cr 0.5% to 3.0% by weight Zr 0.5% to 2.5% by weight Mn 0.1% to 2.0% by weight.

A control process for a rotary pump which is immersed in a fluid produced by a well involves the use of a rotary pump driven by a variable speed motor and comprises the steps of acting upon the rotational speed of the motor according to a pressure difference which exists between the pressure of the fluid measured in the proximity of the pump and the production pressure of the well. The production ...

A wraparound heat-recoverable sleeve (1) is provided with at least one strip of pigmented adhesive (5,6) capable of flowing on application of heat. The pigmented adhesive is placed on the innermost surface of the sleeve (1) directly under the thickest section of the sleeve, e.g. under closure rails (2,3) of the sleeve. The sleeve (1) is wrapped around a substrate (7) and closed by a channel (8). W...