A communication system capable of continuously exchanging digital information in a well logging installation between apparatus arranged on the earth's surface and apparatus arranged in an earth borehole, interconnected by a cable. Both the surface apparatus and the downhole apparatus include a controller and a modem for sending digital command messages downhole and digital data messages uphole. Th...

A method of forming a hydrophlic coating on a substrate comprised of applying a hydrophilic copolymer capable of chemically reacting with a coupling agent which will promote adhesion to the substrate. A polyisocyanate coupling agent is applied to the surface from a solvent solution followed by applying the hydrophilic copolymer from solvent solution. In certain instances, the copolymer and isocyan...

Process for forming a hydrophilic coating on a substrate. A hydrophilic coating on a substrate is formed by applying a hydrophilic copolymer which is able to react chemically with a coupling agent which promotes adherence to the substrate. A polyisocyanate coupling agent is applied to the surface from a solvent solution, after which the hydrophilic copolymer is applied from a solvent solution. In ...

A method for modification of the surface of industrial rubber articles involving treatment of these articles with ionizing radiation in the form of an electric glow discharge and applying a polymer layer onto their surface by admitting into a chamber vapors of esters of methacrylic acid or acrylic acid, and fluorinated alcohol simultaneously with the rubber articles being treated in the electric g...

A suction drainage system for body cavities includes a suction collection container (22), and a disposable suction control chamber (30) through which an essentially constant level of suction is applied to a body cavity. Drained fluids flow into the suction collection container, into the suction control chamber through an elastomeric check valve (46) which precludes backflow of fluids to the patien...

Catalysts for the isomerization of n-paraffins are prepared by treating mordenite with an acid solution comprising Na- or K-ions and thereafter with a solution of an NH4-compound, mixing the thus treated mordenite with an inert binder material on which a Group VIII noble metal has been deposited and finally shaping the resulting mixture under high pressure.

The invention concerns a package of at least two layers of rolls of a compressible material. In this package, the rolls of each layer are placed side by side and in mutual contact, while the rolls of two superposed layers are in mutual contact along their lowermost or uppermost surfaces. In addition, the package contains two contoured panels adjacent the outer layers of the rolls, and two bindings...